/*----------------------------------------------------------------------------/
/  FatFs - Generic FAT Filesystem Module  R0.13c                              /
/-----------------------------------------------------------------------------/
/
/ Copyright (C) 2018, ChaN, all right reserved.
/
/ FatFs module is an open source software. Redistribution and use of FatFs in
/ source and binary forms, with or without modification, are permitted provided
/ that the following condition is met:
/
/ 1. Redistributions of source code must retain the above copyright notice,
/    this condition and the following disclaimer.
/
/ This software is provided by the copyright holder and contributors "AS IS"
/ and any warranties related to this software are DISCLAIMED.
/ The copyright owner or contributors be NOT LIABLE for any damages caused
/ by use of this software.
/
/----------------------------------------------------------------------------*/


#include "ff.h"         /* Declarations of FatFs API */
#include "diskio.h"     /* Declarations of device I/O functions */


/*--------------------------------------------------------------------------

   Module Private Definitions

---------------------------------------------------------------------------*/

#if FF_DEFINED != 86604 /* Revision ID */
#error Wrong include file (ff.h).
#endif


/* Limits and boundaries */
#define MAX_DIR     0x200000        /* Max size of FAT directory */
#define MAX_DIR_EX  0x10000000      /* Max size of exFAT directory */
#define MAX_FAT12   0xFF5           /* Max FAT12 clusters (differs from specs, but right for real DOS/Windows behavior) */
#define MAX_FAT16   0xFFF5          /* Max FAT16 clusters (differs from specs, but right for real DOS/Windows behavior) */
#define MAX_FAT32   0x0FFFFFF5      /* Max FAT32 clusters (not specified, practical limit) */
#define MAX_EXFAT   0x7FFFFFFD      /* Max exFAT clusters (differs from specs, implementation limit) */


/* Character code support macros */
#define IsUpper(c)      ((c) >= 'A' && (c) <= 'Z')
#define IsLower(c)      ((c) >= 'a' && (c) <= 'z')
#define IsDigit(c)      ((c) >= '0' && (c) <= '9')
#define IsSurrogate(c)  ((c) >= 0xD800 && (c) <= 0xDFFF)
#define IsSurrogateH(c) ((c) >= 0xD800 && (c) <= 0xDBFF)
#define IsSurrogateL(c) ((c) >= 0xDC00 && (c) <= 0xDFFF)


/* Additional file access control and file status flags for internal use */
#define FA_SEEKEND  0x20    /* Seek to end of the file on file open */
#define FA_MODIFIED 0x40    /* File has been modified */
#define FA_DIRTY    0x80    /* FIL.buf[] needs to be written-back */


/* Additional file attribute bits for internal use */
#define AM_VOL      0x08    /* Volume label */
#define AM_LFN      0x0F    /* LFN entry */
#define AM_MASK     0x3F    /* Mask of defined bits */


/* Name status flags in fn[11] */
#define NSFLAG      11      /* Index of the name status byte */
#define NS_LOSS     0x01    /* Out of 8.3 format */
#define NS_LFN      0x02    /* Force to create LFN entry */
#define NS_LAST     0x04    /* Last segment */
#define NS_BODY     0x08    /* Lower case flag (body) */
#define NS_EXT      0x10    /* Lower case flag (ext) */
#define NS_DOT      0x20    /* Dot entry */
#define NS_NOLFN    0x40    /* Do not find LFN */
#define NS_NONAME   0x80    /* Not followed */


/* exFAT directory entry types */
#define ET_BITMAP   0x81    /* Allocation bitmap */
#define ET_UPCASE   0x82    /* Up-case table */
#define ET_VLABEL   0x83    /* Volume label */
#define ET_FILEDIR  0x85    /* File and directory */
#define ET_STREAM   0xC0    /* Stream extension */
#define ET_FILENAME 0xC1    /* Name extension */


/* FatFs refers the FAT structure as simple byte array instead of structure member
/ because the C structure is not binary compatible between different platforms */

#define BS_JmpBoot          0       /* x86 jump instruction (3-byte) */
#define BS_OEMName          3       /* OEM name (8-byte) */
#define BPB_BytsPerSec      11      /* Sector size [byte] (WORD) */
#define BPB_SecPerClus      13      /* Cluster size [sector] (BYTE) */
#define BPB_RsvdSecCnt      14      /* Size of reserved area [sector] (WORD) */
#define BPB_NumFATs         16      /* Number of FATs (BYTE) */
#define BPB_RootEntCnt      17      /* Size of root directory area for FAT [entry] (WORD) */
#define BPB_TotSec16        19      /* Volume size (16-bit) [sector] (WORD) */
#define BPB_Media           21      /* Media descriptor byte (BYTE) */
#define BPB_FATSz16         22      /* FAT size (16-bit) [sector] (WORD) */
#define BPB_SecPerTrk       24      /* Number of sectors per track for int13h [sector] (WORD) */
#define BPB_NumHeads        26      /* Number of heads for int13h (WORD) */
#define BPB_HiddSec         28      /* Volume offset from top of the drive (DWORD) */
#define BPB_TotSec32        32      /* Volume size (32-bit) [sector] (DWORD) */
#define BS_DrvNum           36      /* Physical drive number for int13h (BYTE) */
#define BS_NTres            37      /* WindowsNT error flag (BYTE) */
#define BS_BootSig          38      /* Extended boot signature (BYTE) */
#define BS_VolID            39      /* Volume serial number (DWORD) */
#define BS_VolLab           43      /* Volume label string (8-byte) */
#define BS_FilSysType       54      /* Filesystem type string (8-byte) */
#define BS_BootCode         62      /* Boot code (448-byte) */
#define BS_55AA             510     /* Signature word (WORD) */

#define BPB_FATSz32         36      /* FAT32: FAT size [sector] (DWORD) */
#define BPB_ExtFlags32      40      /* FAT32: Extended flags (WORD) */
#define BPB_FSVer32         42      /* FAT32: Filesystem version (WORD) */
#define BPB_RootClus32      44      /* FAT32: Root directory cluster (DWORD) */
#define BPB_FSInfo32        48      /* FAT32: Offset of FSINFO sector (WORD) */
#define BPB_BkBootSec32     50      /* FAT32: Offset of backup boot sector (WORD) */
#define BS_DrvNum32         64      /* FAT32: Physical drive number for int13h (BYTE) */
#define BS_NTres32          65      /* FAT32: Error flag (BYTE) */
#define BS_BootSig32        66      /* FAT32: Extended boot signature (BYTE) */
#define BS_VolID32          67      /* FAT32: Volume serial number (DWORD) */
#define BS_VolLab32         71      /* FAT32: Volume label string (8-byte) */
#define BS_FilSysType32     82      /* FAT32: Filesystem type string (8-byte) */
#define BS_BootCode32       90      /* FAT32: Boot code (420-byte) */

#define BPB_ZeroedEx        11      /* exFAT: MBZ field (53-byte) */
#define BPB_VolOfsEx        64      /* exFAT: Volume offset from top of the drive [sector] (QWORD) */
#define BPB_TotSecEx        72      /* exFAT: Volume size [sector] (QWORD) */
#define BPB_FatOfsEx        80      /* exFAT: FAT offset from top of the volume [sector] (DWORD) */
#define BPB_FatSzEx         84      /* exFAT: FAT size [sector] (DWORD) */
#define BPB_DataOfsEx       88      /* exFAT: Data offset from top of the volume [sector] (DWORD) */
#define BPB_NumClusEx       92      /* exFAT: Number of clusters (DWORD) */
#define BPB_RootClusEx      96      /* exFAT: Root directory start cluster (DWORD) */
#define BPB_VolIDEx         100     /* exFAT: Volume serial number (DWORD) */
#define BPB_FSVerEx         104     /* exFAT: Filesystem version (WORD) */
#define BPB_VolFlagEx       106     /* exFAT: Volume flags (WORD) */
#define BPB_BytsPerSecEx    108     /* exFAT: Log2 of sector size in unit of byte (BYTE) */
#define BPB_SecPerClusEx    109     /* exFAT: Log2 of cluster size in unit of sector (BYTE) */
#define BPB_NumFATsEx       110     /* exFAT: Number of FATs (BYTE) */
#define BPB_DrvNumEx        111     /* exFAT: Physical drive number for int13h (BYTE) */
#define BPB_PercInUseEx     112     /* exFAT: Percent in use (BYTE) */
#define BPB_RsvdEx          113     /* exFAT: Reserved (7-byte) */
#define BS_BootCodeEx       120     /* exFAT: Boot code (390-byte) */

#define DIR_Name            0       /* Short file name (11-byte) */
#define DIR_Attr            11      /* Attribute (BYTE) */
#define DIR_NTres           12      /* Lower case flag (BYTE) */
#define DIR_CrtTime10       13      /* Created time sub-second (BYTE) */
#define DIR_CrtTime         14      /* Created time (DWORD) */
#define DIR_LstAccDate      18      /* Last accessed date (WORD) */
#define DIR_FstClusHI       20      /* Higher 16-bit of first cluster (WORD) */
#define DIR_ModTime         22      /* Modified time (DWORD) */
#define DIR_FstClusLO       26      /* Lower 16-bit of first cluster (WORD) */
#define DIR_FileSize        28      /* File size (DWORD) */
#define LDIR_Ord            0       /* LFN: LFN order and LLE flag (BYTE) */
#define LDIR_Attr           11      /* LFN: LFN attribute (BYTE) */
#define LDIR_Type           12      /* LFN: Entry type (BYTE) */
#define LDIR_Chksum         13      /* LFN: Checksum of the SFN (BYTE) */
#define LDIR_FstClusLO      26      /* LFN: MBZ field (WORD) */
#define XDIR_Type           0       /* exFAT: Type of exFAT directory entry (BYTE) */
#define XDIR_NumLabel       1       /* exFAT: Number of volume label characters (BYTE) */
#define XDIR_Label          2       /* exFAT: Volume label (11-WORD) */
#define XDIR_CaseSum        4       /* exFAT: Sum of case conversion table (DWORD) */
#define XDIR_NumSec         1       /* exFAT: Number of secondary entries (BYTE) */
#define XDIR_SetSum         2       /* exFAT: Sum of the set of directory entries (WORD) */
#define XDIR_Attr           4       /* exFAT: File attribute (WORD) */
#define XDIR_CrtTime        8       /* exFAT: Created time (DWORD) */
#define XDIR_ModTime        12      /* exFAT: Modified time (DWORD) */
#define XDIR_AccTime        16      /* exFAT: Last accessed time (DWORD) */
#define XDIR_CrtTime10      20      /* exFAT: Created time subsecond (BYTE) */
#define XDIR_ModTime10      21      /* exFAT: Modified time subsecond (BYTE) */
#define XDIR_CrtTZ          22      /* exFAT: Created timezone (BYTE) */
#define XDIR_ModTZ          23      /* exFAT: Modified timezone (BYTE) */
#define XDIR_AccTZ          24      /* exFAT: Last accessed timezone (BYTE) */
#define XDIR_GenFlags       33      /* exFAT: General secondary flags (BYTE) */
#define XDIR_NumName        35      /* exFAT: Number of file name characters (BYTE) */
#define XDIR_NameHash       36      /* exFAT: Hash of file name (WORD) */
#define XDIR_ValidFileSize  40      /* exFAT: Valid file size (QWORD) */
#define XDIR_FstClus        52      /* exFAT: First cluster of the file data (DWORD) */
#define XDIR_FileSize       56      /* exFAT: File/Directory size (QWORD) */

#define SZDIRE              32      /* Size of a directory entry */
#define DDEM                0xE5    /* Deleted directory entry mark set to DIR_Name[0] */
#define RDDEM               0x05    /* Replacement of the character collides with DDEM */
#define LLEF                0x40    /* Last long entry flag in LDIR_Ord */

#define FSI_LeadSig         0       /* FAT32 FSI: Leading signature (DWORD) */
#define FSI_StrucSig        484     /* FAT32 FSI: Structure signature (DWORD) */
#define FSI_Free_Count      488     /* FAT32 FSI: Number of free clusters (DWORD) */
#define FSI_Nxt_Free        492     /* FAT32 FSI: Last allocated cluster (DWORD) */

#define MBR_Table           446     /* MBR: Offset of partition table in the MBR */
#define SZ_PTE              16      /* MBR: Size of a partition table entry */
#define PTE_Boot            0       /* MBR PTE: Boot indicator */
#define PTE_StHead          1       /* MBR PTE: Start head */
#define PTE_StSec           2       /* MBR PTE: Start sector */
#define PTE_StCyl           3       /* MBR PTE: Start cylinder */
#define PTE_System          4       /* MBR PTE: System ID */
#define PTE_EdHead          5       /* MBR PTE: End head */
#define PTE_EdSec           6       /* MBR PTE: End sector */
#define PTE_EdCyl           7       /* MBR PTE: End cylinder */
#define PTE_StLba           8       /* MBR PTE: Start in LBA */
#define PTE_SizLba          12      /* MBR PTE: Size in LBA */


/* Post process on fatal error in the file operations */
#define ABORT(fs, res)      { fp->err = (BYTE)(res); LEAVE_FF(fs, res); }


/* Re-entrancy related */
#if FF_FS_REENTRANT
#if FF_USE_LFN == 1
#error Static LFN work area cannot be used at thread-safe configuration
#endif
#define LEAVE_FF(fs, res)   { unlock_fs(fs, res); return res; }
#else
#define LEAVE_FF(fs, res)   return res
#endif


/* Definitions of volume - physical location conversion */
#if FF_MULTI_PARTITION
#define LD2PD(vol) VolToPart[vol].pd    /* Get physical drive number */
#define LD2PT(vol) VolToPart[vol].pt    /* Get partition index */
#else
#define LD2PD(vol) (BYTE)(vol)  /* Each logical drive is bound to the same physical drive number */
#define LD2PT(vol) 0            /* Find first valid partition or in SFD */
#endif


/* Definitions of sector size */
#if (FF_MAX_SS < FF_MIN_SS) || (FF_MAX_SS != 512 && FF_MAX_SS != 1024 && FF_MAX_SS != 2048 && FF_MAX_SS != 4096) || (FF_MIN_SS != 512 && FF_MIN_SS != 1024 && FF_MIN_SS != 2048 && FF_MIN_SS != 4096)
#error Wrong sector size configuration
#endif
#if FF_MAX_SS == FF_MIN_SS
#define SS(fs)  ((UINT)FF_MAX_SS)   /* Fixed sector size */
#else
#define SS(fs)  ((fs)->ssize)   /* Variable sector size */
#endif


/* Timestamp */
#if FF_FS_NORTC == 1
#if FF_NORTC_YEAR < 1980 || FF_NORTC_YEAR > 2107 || FF_NORTC_MON < 1 || FF_NORTC_MON > 12 || FF_NORTC_MDAY < 1 || FF_NORTC_MDAY > 31
#error Invalid FF_FS_NORTC settings
#endif
#define GET_FATTIME()   ((DWORD)(FF_NORTC_YEAR - 1980) << 25 | (DWORD)FF_NORTC_MON << 21 | (DWORD)FF_NORTC_MDAY << 16)
#else
#define GET_FATTIME()   get_fattime()
#endif


/* File lock controls */
#if FF_FS_LOCK != 0
#if FF_FS_READONLY
#error FF_FS_LOCK must be 0 at read-only configuration
#endif
typedef struct {
    FATFS *fs;      /* Object ID 1, volume (NULL:blank entry) */
    DWORD clu;      /* Object ID 2, containing directory (0:root) */
    DWORD ofs;      /* Object ID 3, offset in the directory */
    WORD ctr;       /* Object open counter, 0:none, 0x01..0xFF:read mode open count, 0x100:write mode */
} FILESEM;
#endif


/* SBCS up-case tables (\x80-\xFF) */
#define TBL_CT437  {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
                    0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT720  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
                    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT737  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
                    0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
                    0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xEF,0xF5,0xF0,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT771  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
                    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDC,0xDE,0xDE, \
                    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFE,0xFF}
#define TBL_CT775  {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F, \
                    0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                    0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT850  {0x43,0x55,0x45,0x41,0x41,0x41,0x41,0x43,0x45,0x45,0x45,0x49,0x49,0x49,0x41,0x41, \
                    0x45,0x92,0x92,0x4F,0x4F,0x4F,0x55,0x55,0x59,0x4F,0x55,0x4F,0x9C,0x4F,0x9E,0x9F, \
                    0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0x41,0x41,0x41,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0x41,0x41,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD1,0xD1,0x45,0x45,0x45,0x49,0x49,0x49,0x49,0xD9,0xDA,0xDB,0xDC,0xDD,0x49,0xDF, \
                    0x4F,0xE1,0x4F,0x4F,0x4F,0x4F,0xE6,0xE8,0xE8,0x55,0x55,0x55,0x59,0x59,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT852  {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F, \
                    0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0xAC, \
                    0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}
#define TBL_CT855  {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F, \
                    0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
                    0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
                    0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF, \
                    0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT857  {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x49,0x8E,0x8F, \
                    0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
                    0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0x49,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT860  {0x80,0x9A,0x90,0x8F,0x8E,0x91,0x86,0x80,0x89,0x89,0x92,0x8B,0x8C,0x98,0x8E,0x8F, \
                    0x90,0x91,0x92,0x8C,0x99,0xA9,0x96,0x9D,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0x86,0x8B,0x9F,0x96,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT861  {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x8B,0x8B,0x8D,0x8E,0x8F, \
                    0x90,0x92,0x92,0x4F,0x99,0x8D,0x55,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                    0xA4,0xA5,0xA6,0xA7,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT862  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
                    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT863  {0x43,0x55,0x45,0x41,0x41,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x41,0x8F, \
                    0x45,0x45,0x45,0x4F,0x45,0x49,0x55,0x55,0x98,0x4F,0x55,0x9B,0x9C,0x55,0x55,0x9F, \
                    0xA0,0xA1,0x4F,0x55,0xA4,0xA5,0xA6,0xA7,0x49,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT864  {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
                    0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT865  {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
                    0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
                    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT866  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
                    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                    0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#define TBL_CT869  {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
                    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x86,0x9C,0x8D,0x8F,0x90, \
                    0x91,0x90,0x92,0x95,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xA4,0xA5,0xA6,0xD9,0xDA,0xDB,0xDC,0xA7,0xA8,0xDF, \
                    0xA9,0xAA,0xAC,0xAD,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xCF,0xCF,0xD0,0xEF, \
                    0xF0,0xF1,0xD1,0xD2,0xD3,0xF5,0xD4,0xF7,0xF8,0xF9,0xD5,0x96,0x95,0x98,0xFE,0xFF}


/* DBCS code range |----- 1st byte -----|  |----------- 2nd byte -----------| */
#define TBL_DC932 {0x81, 0x9F, 0xE0, 0xFC, 0x40, 0x7E, 0x80, 0xFC, 0x00, 0x00}
#define TBL_DC936 {0x81, 0xFE, 0x00, 0x00, 0x40, 0x7E, 0x80, 0xFE, 0x00, 0x00}
#define TBL_DC949 {0x81, 0xFE, 0x00, 0x00, 0x41, 0x5A, 0x61, 0x7A, 0x81, 0xFE}
#define TBL_DC950 {0x81, 0xFE, 0x00, 0x00, 0x40, 0x7E, 0xA1, 0xFE, 0x00, 0x00}


/* Macros for table definitions */
#define MERGE_2STR(a, b) a ## b
#define MKCVTBL(hd, cp) MERGE_2STR(hd, cp)




/*--------------------------------------------------------------------------

   Module Private Work Area

---------------------------------------------------------------------------*/
/* Remark: Variables defined here without initial value shall be guaranteed
/  zero/null at start-up. If not, the linker option or start-up routine is
/  not compliance with C standard. */

/*--------------------------------*/
/* File/Volume controls           */
/*--------------------------------*/

#if FF_VOLUMES < 1 || FF_VOLUMES > 10
#error Wrong FF_VOLUMES setting
#endif
static FATFS *FatFs[FF_VOLUMES];    /* Pointer to the filesystem objects (logical drives) */
static WORD Fsid;                   /* Filesystem mount ID */

#if FF_FS_RPATH != 0
static BYTE CurrVol;                /* Current drive */
#endif

#if FF_FS_LOCK != 0
static FILESEM Files[FF_FS_LOCK];   /* Open object lock semaphores */
#endif

#if FF_STR_VOLUME_ID
#ifdef FF_VOLUME_STRS
static const char *const VolumeStr[FF_VOLUMES] = {FF_VOLUME_STRS};  /* Pre-defined volume ID */
#endif
#endif


/*--------------------------------*/
/* LFN/Directory working buffer   */
/*--------------------------------*/

#if FF_USE_LFN == 0     /* Non-LFN configuration */
#if FF_FS_EXFAT
#error LFN must be enabled when enable exFAT
#endif
#define DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define FREE_NAMBUF()
#define LEAVE_MKFS(res) return res

#else                   /* LFN configurations */
#if FF_MAX_LFN < 12 || FF_MAX_LFN > 255
#error Wrong setting of FF_MAX_LFN
#endif
#if FF_LFN_BUF < FF_SFN_BUF || FF_SFN_BUF < 12
#error Wrong setting of FF_LFN_BUF or FF_SFN_BUF
#endif
#if FF_LFN_UNICODE < 0 || FF_LFN_UNICODE > 3
#error Wrong setting of FF_LFN_UNICODE
#endif
static const BYTE LfnOfs[] = {1, 3, 5, 7, 9, 14, 16, 18, 20, 22, 24, 28, 30}; /* FAT: Offset of LFN characters in the directory entry */
#define MAXDIRB(nc) ((nc + 44U) / 15 * SZDIRE)  /* exFAT: Size of directory entry block scratchpad buffer needed for the name length */

#if FF_USE_LFN == 1     /* LFN enabled with static working buffer */
#if FF_FS_EXFAT
static BYTE DirBuf[MAXDIRB(FF_MAX_LFN)];    /* Directory entry block scratchpad buffer */
#endif
static WCHAR LfnBuf[FF_MAX_LFN + 1];        /* LFN working buffer */
#define DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define FREE_NAMBUF()
#define LEAVE_MKFS(res) return res

#elif FF_USE_LFN == 2   /* LFN enabled with dynamic working buffer on the stack */
#if FF_FS_EXFAT
#define DEF_NAMBUF      WCHAR lbuf[FF_MAX_LFN+1]; BYTE dbuf[MAXDIRB(FF_MAX_LFN)];   /* LFN working buffer and directory entry block scratchpad buffer */
#define INIT_NAMBUF(fs) { (fs)->lfnbuf = lbuf; (fs)->dirbuf = dbuf; }
#define FREE_NAMBUF()
#else
#define DEF_NAMBUF      WCHAR lbuf[FF_MAX_LFN+1];   /* LFN working buffer */
#define INIT_NAMBUF(fs) { (fs)->lfnbuf = lbuf; }
#define FREE_NAMBUF()
#endif
#define LEAVE_MKFS(res) return res

#elif FF_USE_LFN == 3   /* LFN enabled with dynamic working buffer on the heap */
#if FF_FS_EXFAT
#define DEF_NAMBUF      WCHAR *lfn; /* Pointer to LFN working buffer and directory entry block scratchpad buffer */
#define INIT_NAMBUF(fs) { lfn = ff_memalloc((FF_MAX_LFN+1)*2 + MAXDIRB(FF_MAX_LFN)); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; (fs)->dirbuf = (BYTE*)(lfn+FF_MAX_LFN+1); }
#define FREE_NAMBUF()   ff_memfree(lfn)
#else
#define DEF_NAMBUF      WCHAR *lfn; /* Pointer to LFN working buffer */
#define INIT_NAMBUF(fs) { lfn = ff_memalloc((FF_MAX_LFN+1)*2); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; }
#define FREE_NAMBUF()   ff_memfree(lfn)
#endif
#define LEAVE_MKFS(res) { if (!work) ff_memfree(buf); return res; }
#define MAX_MALLOC  0x8000  /* Must be >=FF_MAX_SS */

#else
#error Wrong setting of FF_USE_LFN

#endif  /* FF_USE_LFN == 1 */
#endif  /* FF_USE_LFN == 0 */



/*--------------------------------*/
/* Code conversion tables         */
/*--------------------------------*/

#if FF_CODE_PAGE == 0       /* Run-time code page configuration */
#define CODEPAGE CodePage
static WORD CodePage;   /* Current code page */
static const BYTE *ExCvt, *DbcTbl;  /* Pointer to current SBCS up-case table and DBCS code range table below */

static const BYTE Ct437[] = TBL_CT437;
static const BYTE Ct720[] = TBL_CT720;
static const BYTE Ct737[] = TBL_CT737;
static const BYTE Ct771[] = TBL_CT771;
static const BYTE Ct775[] = TBL_CT775;
static const BYTE Ct850[] = TBL_CT850;
static const BYTE Ct852[] = TBL_CT852;
static const BYTE Ct855[] = TBL_CT855;
static const BYTE Ct857[] = TBL_CT857;
static const BYTE Ct860[] = TBL_CT860;
static const BYTE Ct861[] = TBL_CT861;
static const BYTE Ct862[] = TBL_CT862;
static const BYTE Ct863[] = TBL_CT863;
static const BYTE Ct864[] = TBL_CT864;
static const BYTE Ct865[] = TBL_CT865;
static const BYTE Ct866[] = TBL_CT866;
static const BYTE Ct869[] = TBL_CT869;
static const BYTE Dc932[] = TBL_DC932;
static const BYTE Dc936[] = TBL_DC936;
static const BYTE Dc949[] = TBL_DC949;
static const BYTE Dc950[] = TBL_DC950;

#elif FF_CODE_PAGE < 900    /* Static code page configuration (SBCS) */
#define CODEPAGE FF_CODE_PAGE
static const BYTE ExCvt[] = MKCVTBL(TBL_CT, FF_CODE_PAGE);

#else                   /* Static code page configuration (DBCS) */
#define CODEPAGE FF_CODE_PAGE
static const BYTE DbcTbl[] = MKCVTBL(TBL_DC, FF_CODE_PAGE);

#endif




/*--------------------------------------------------------------------------

   Module Private Functions

---------------------------------------------------------------------------*/


/*-----------------------------------------------------------------------*/
/* Load/Store multi-byte word in the FAT structure                       */
/*-----------------------------------------------------------------------*/

static WORD ld_word(const BYTE *ptr)    /*   Load a 2-byte little-endian word */
{
    WORD rv;

    rv = ptr[1];
    rv = rv << 8 | ptr[0];
    return rv;
}

static DWORD ld_dword(const BYTE *ptr)  /* Load a 4-byte little-endian word */
{
    DWORD rv;

    rv = ptr[3];
    rv = rv << 8 | ptr[2];
    rv = rv << 8 | ptr[1];
    rv = rv << 8 | ptr[0];
    return rv;
}

#if FF_FS_EXFAT
static QWORD ld_qword(const BYTE *ptr)  /* Load an 8-byte little-endian word */
{
    QWORD rv;

    rv = ptr[7];
    rv = rv << 8 | ptr[6];
    rv = rv << 8 | ptr[5];
    rv = rv << 8 | ptr[4];
    rv = rv << 8 | ptr[3];
    rv = rv << 8 | ptr[2];
    rv = rv << 8 | ptr[1];
    rv = rv << 8 | ptr[0];
    return rv;
}
#endif

#if !FF_FS_READONLY
static void st_word(BYTE *ptr, WORD val)    /* Store a 2-byte word in little-endian */
{
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
}

static void st_dword(BYTE *ptr, DWORD val)  /* Store a 4-byte word in little-endian */
{
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
}

#if FF_FS_EXFAT
static void st_qword(BYTE *ptr, QWORD val)  /* Store an 8-byte word in little-endian */
{
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
    val >>= 8;
    *ptr++ = (BYTE)val;
}
#endif
#endif  /* !FF_FS_READONLY */



/*-----------------------------------------------------------------------*/
/* String functions                                                      */
/*-----------------------------------------------------------------------*/

/* Copy memory to memory */
static void mem_cpy(void *dst, const void *src, UINT cnt)
{
    BYTE *d = (BYTE *)dst;
    const BYTE *s = (const BYTE *)src;

    if(cnt != 0) {
        do {
            *d++ = *s++;
        } while(--cnt);
    }
}


/* Fill memory block */
static void mem_set(void *dst, int val, UINT cnt)
{
    BYTE *d = (BYTE *)dst;

    do {
        *d++ = (BYTE)val;
    } while(--cnt);
}


/* Compare memory block */
static int mem_cmp(const void *dst, const void *src, UINT cnt)  /* ZR:same, NZ:different */
{
    const BYTE *d = (const BYTE *)dst, *s = (const BYTE *)src;
    int r = 0;

    do {
        r = *d++ - *s++;
    } while(--cnt && r == 0);

    return r;
}


/* Check if chr is contained in the string */
static int chk_chr(const char *str, int chr)    /* NZ:contained, ZR:not contained */
{
    while(*str && *str != chr) {
        str++;
    }
    return *str;
}


/* Test if the character is DBC 1st byte */
static int dbc_1st(BYTE c)
{
#if FF_CODE_PAGE == 0       /* Variable code page */
    if(DbcTbl && c >= DbcTbl[0]) {
        if(c <= DbcTbl[1]) {
            return 1;    /* 1st byte range 1 */
        }
        if(c >= DbcTbl[2] && c <= DbcTbl[3]) {
            return 1;    /* 1st byte range 2 */
        }
    }
#elif FF_CODE_PAGE >= 900   /* DBCS fixed code page */
    if(c >= DbcTbl[0]) {
        if(c <= DbcTbl[1]) {
            return 1;
        }
        if(c >= DbcTbl[2] && c <= DbcTbl[3]) {
            return 1;
        }
    }
#else                       /* SBCS fixed code page */
    if(c != 0) {
        return 0;    /* Always false */
    }
#endif
    return 0;
}


/* Test if the character is DBC 2nd byte */
static int dbc_2nd(BYTE c)
{
#if FF_CODE_PAGE == 0       /* Variable code page */
    if(DbcTbl && c >= DbcTbl[4]) {
        if(c <= DbcTbl[5]) {
            return 1;    /* 2nd byte range 1 */
        }
        if(c >= DbcTbl[6] && c <= DbcTbl[7]) {
            return 1;    /* 2nd byte range 2 */
        }
        if(c >= DbcTbl[8] && c <= DbcTbl[9]) {
            return 1;    /* 2nd byte range 3 */
        }
    }
#elif FF_CODE_PAGE >= 900   /* DBCS fixed code page */
    if(c >= DbcTbl[4]) {
        if(c <= DbcTbl[5]) {
            return 1;
        }
        if(c >= DbcTbl[6] && c <= DbcTbl[7]) {
            return 1;
        }
        if(c >= DbcTbl[8] && c <= DbcTbl[9]) {
            return 1;
        }
    }
#else                       /* SBCS fixed code page */
    if(c != 0) {
        return 0;    /* Always false */
    }
#endif
    return 0;
}


#if FF_USE_LFN

/* Get a character from TCHAR string in defined API encodeing */
static DWORD tchar2uni(  /* Returns character in UTF-16 encoding (>=0x10000 on double encoding unit, 0xFFFFFFFF on decode error) */
    const TCHAR **str       /* Pointer to pointer to TCHAR string in configured encoding */
)
{
    DWORD uc;
    const TCHAR *p = *str;

#if FF_LFN_UNICODE == 1     /* UTF-16 input */
    WCHAR wc;

    uc = *p++;  /* Get a unit */
    if(IsSurrogate(uc)) {   /* Surrogate? */
        wc = *p++;      /* Get low surrogate */
        if(!IsSurrogateH(uc) || !IsSurrogateL(wc)) {
            return 0xFFFFFFFF;    /* Wrong surrogate? */
        }
        uc = uc << 16 | wc;
    }

#elif FF_LFN_UNICODE == 2   /* UTF-8 input */
    BYTE b;
    int nf;

    uc = (BYTE) * p++;  /* Get a unit */
    if(uc & 0x80) {     /* Multiple byte code? */
        if((uc & 0xE0) == 0xC0) {   /* 2-byte sequence? */
            uc &= 0x1F;
            nf = 1;
        } else {
            if((uc & 0xF0) == 0xE0) {   /* 3-byte sequence? */
                uc &= 0x0F;
                nf = 2;
            } else {
                if((uc & 0xF8) == 0xF0) {   /* 4-byte sequence? */
                    uc &= 0x07;
                    nf = 3;
                } else {                    /* Wrong sequence */
                    return 0xFFFFFFFF;
                }
            }
        }
        do {    /* Get trailing bytes */
            b = (BYTE) * p++;
            if((b & 0xC0) != 0x80) {
                return 0xFFFFFFFF;    /* Wrong sequence? */
            }
            uc = uc << 6 | (b & 0x3F);
        } while(--nf != 0);
        if(uc < 0x80 || IsSurrogate(uc) || uc >= 0x110000) {
            return 0xFFFFFFFF;    /* Wrong code? */
        }
        if(uc >= 0x010000) {
            uc = 0xD800DC00 | ((uc - 0x10000) << 6 & 0x3FF0000) | (uc & 0x3FF);    /* Make a surrogate pair if needed */
        }
    }

#elif FF_LFN_UNICODE == 3   /* UTF-32 input */
    uc = (TCHAR) * p++; /* Get a unit */
    if(uc >= 0x110000) {
        return 0xFFFFFFFF;    /* Wrong code? */
    }
    if(uc >= 0x010000) {
        uc = 0xD800DC00 | ((uc - 0x10000) << 6 & 0x3FF0000) | (uc & 0x3FF);    /* Make a surrogate pair if needed */
    }

#else       /* ANSI/OEM input */
    BYTE b;
    WCHAR wc;

    wc = (BYTE) * p++;          /* Get a byte */
    if(dbc_1st((BYTE)wc)) {     /* Is it a DBC 1st byte? */
        b = (BYTE) * p++;       /* Get 2nd byte */
        if(!dbc_2nd(b)) {
            return 0xFFFFFFFF;    /* Invalid code? */
        }
        wc = (wc << 8) + b;     /* Make a DBC */
    }
    if(wc != 0) {
        wc = ff_oem2uni(wc, CODEPAGE);  /* ANSI/OEM ==> Unicode */
        if(wc == 0) {
            return 0xFFFFFFFF;    /* Invalid code? */
        }
    }
    uc = wc;

#endif
    *str = p;   /* Next read pointer */
    return uc;
}


/* Output a TCHAR string in defined API encoding */
static BYTE put_utf(  /* Returns number of encoding units written (0:buffer overflow or wrong encoding) */
    DWORD chr,  /* UTF-16 encoded character (Double encoding unit char if >=0x10000) */
    TCHAR *buf, /* Output buffer */
    UINT szb    /* Size of the buffer */
)
{
#if FF_LFN_UNICODE == 1 /* UTF-16 output */
    WCHAR hs, wc;

    hs = (WCHAR)(chr >> 16);
    wc = (WCHAR)chr;
    if(hs == 0) {   /* Single encoding unit? */
        if(szb < 1 || IsSurrogate(wc)) {
            return 0;    /* Buffer overflow or wrong code? */
        }
        *buf = wc;
        return 1;
    }
    if(szb < 2 || !IsSurrogateH(hs) || !IsSurrogateL(wc)) {
        return 0;    /* Buffer overflow or wrong surrogate? */
    }
    *buf++ = hs;
    *buf++ = wc;
    return 2;

#elif FF_LFN_UNICODE == 2   /* UTF-8 output */
    DWORD hc;

    if(chr < 0x80) {    /* Single byte code? */
        if(szb < 1) {
            return 0;    /* Buffer overflow? */
        }
        *buf = (TCHAR)chr;
        return 1;
    }
    if(chr < 0x800) {   /* 2-byte sequence? */
        if(szb < 2) {
            return 0;    /* Buffer overflow? */
        }
        *buf++ = (TCHAR)(0xC0 | (chr >> 6 & 0x1F));
        *buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
        return 2;
    }
    if(chr < 0x10000) {     /* 3-byte sequence? */
        if(szb < 3 || IsSurrogate(chr)) {
            return 0;    /* Buffer overflow or wrong code? */
        }
        *buf++ = (TCHAR)(0xE0 | (chr >> 12 & 0x0F));
        *buf++ = (TCHAR)(0x80 | (chr >> 6 & 0x3F));
        *buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
        return 3;
    }
    /* 4-byte sequence */
    if(szb < 4) {
        return 0;    /* Buffer overflow? */
    }
    hc = ((chr & 0xFFFF0000) - 0xD8000000) >> 6;    /* Get high 10 bits */
    chr = (chr & 0xFFFF) - 0xDC00;                  /* Get low 10 bits */
    if(hc >= 0x100000 || chr >= 0x400) {
        return 0;    /* Wrong surrogate? */
    }
    chr = (hc | chr) + 0x10000;
    *buf++ = (TCHAR)(0xF0 | (chr >> 18 & 0x07));
    *buf++ = (TCHAR)(0x80 | (chr >> 12 & 0x3F));
    *buf++ = (TCHAR)(0x80 | (chr >> 6 & 0x3F));
    *buf++ = (TCHAR)(0x80 | (chr >> 0 & 0x3F));
    return 4;

#elif FF_LFN_UNICODE == 3   /* UTF-32 output */
    DWORD hc;

    if(szb < 1) {
        return 0;    /* Buffer overflow? */
    }
    if(chr >= 0x10000) {    /* Out of BMP? */
        hc = ((chr & 0xFFFF0000) - 0xD8000000) >> 6;    /* Get high 10 bits */
        chr = (chr & 0xFFFF) - 0xDC00;                  /* Get low 10 bits */
        if(hc >= 0x100000 || chr >= 0x400) {
            return 0;    /* Wrong surrogate? */
        }
        chr = (hc | chr) + 0x10000;
    }
    *buf++ = (TCHAR)chr;
    return 1;

#else                       /* ANSI/OEM output */
    WCHAR wc;

    wc = ff_uni2oem(chr, CODEPAGE);
    if(wc >= 0x100) {   /* Is this a DBC? */
        if(szb < 2) {
            return 0;
        }
        *buf++ = (char)(wc >> 8);   /* Store DBC 1st byte */
        *buf++ = (TCHAR)wc;         /* Store DBC 2nd byte */
        return 2;
    }
    if(wc == 0 || szb < 1) {
        return 0;    /* Invalid char or buffer overflow? */
    }
    *buf++ = (TCHAR)wc;                 /* Store the character */
    return 1;
#endif
}
#endif  /* FF_USE_LFN */


#if FF_FS_REENTRANT
/*-----------------------------------------------------------------------*/
/* Request/Release grant to access the volume                            */
/*-----------------------------------------------------------------------*/
static int lock_fs(   /* 1:Ok, 0:timeout */
    FATFS *fs       /* Filesystem object */
)
{
    return ff_req_grant(fs->sobj);
}


static void unlock_fs(
    FATFS *fs,      /* Filesystem object */
    FRESULT res     /* Result code to be returned */
)
{
    if(fs && res != FR_NOT_ENABLED && res != FR_INVALID_DRIVE && res != FR_TIMEOUT) {
        ff_rel_grant(fs->sobj);
    }
}

#endif



#if FF_FS_LOCK != 0
/*-----------------------------------------------------------------------*/
/* File lock control functions                                           */
/*-----------------------------------------------------------------------*/

static FRESULT chk_lock(  /* Check if the file can be accessed */
    DIR *dp,        /* Directory object pointing the file to be checked */
    int acc         /* Desired access type (0:Read mode open, 1:Write mode open, 2:Delete or rename) */
)
{
    UINT i, be;

    /* Search open object table for the object */
    be = 0;
    for(i = 0; i < FF_FS_LOCK; i++) {
        if(Files[i].fs) {   /* Existing entry */
            if(Files[i].fs == dp->obj.fs &&         /* Check if the object matches with an open object */
                    Files[i].clu == dp->obj.sclust &&
                    Files[i].ofs == dp->dptr) {
                break;
            }
        } else {            /* Blank entry */
            be = 1;
        }
    }
    if(i == FF_FS_LOCK) {   /* The object has not been opened */
        return (!be && acc != 2) ? FR_TOO_MANY_OPEN_FILES : FR_OK;  /* Is there a blank entry for new object? */
    }

    /* The object was opened. Reject any open against writing file and all write mode open */
    return (acc != 0 || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
}


static int enq_lock(void)   /* Check if an entry is available for a new object */
{
    UINT i;

    for(i = 0; i < FF_FS_LOCK && Files[i].fs; i++) ;
    return (i == FF_FS_LOCK) ? 0 : 1;
}


static UINT inc_lock(  /* Increment object open counter and returns its index (0:Internal error) */
    DIR *dp,    /* Directory object pointing the file to register or increment */
    int acc     /* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
)
{
    UINT i;


    for(i = 0; i < FF_FS_LOCK; i++) {   /* Find the object */
        if(Files[i].fs == dp->obj.fs &&
                Files[i].clu == dp->obj.sclust &&
                Files[i].ofs == dp->dptr) {
            break;
        }
    }

    if(i == FF_FS_LOCK) {               /* Not opened. Register it as new. */
        for(i = 0; i < FF_FS_LOCK && Files[i].fs; i++) ;
        if(i == FF_FS_LOCK) {
            return 0;    /* No free entry to register (int err) */
        }
        Files[i].fs = dp->obj.fs;
        Files[i].clu = dp->obj.sclust;
        Files[i].ofs = dp->dptr;
        Files[i].ctr = 0;
    }

    if(acc >= 1 && Files[i].ctr) {
        return 0;    /* Access violation (int err) */
    }

    Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;  /* Set semaphore value */

    return i + 1;   /* Index number origin from 1 */
}


static FRESULT dec_lock(  /* Decrement object open counter */
    UINT i          /* Semaphore index (1..) */
)
{
    WORD n;
    FRESULT res;


    if(--i < FF_FS_LOCK) {  /* Index number origin from 0 */
        n = Files[i].ctr;
        if(n == 0x100) {
            n = 0;    /* If write mode open, delete the entry */
        }
        if(n > 0) {
            n--;    /* Decrement read mode open count */
        }
        Files[i].ctr = n;
        if(n == 0) {
            Files[i].fs = 0;    /* Delete the entry if open count gets zero */
        }
        res = FR_OK;
    } else {
        res = FR_INT_ERR;           /* Invalid index nunber */
    }
    return res;
}


static void clear_lock(  /* Clear lock entries of the volume */
    FATFS *fs
)
{
    UINT i;

    for(i = 0; i < FF_FS_LOCK; i++) {
        if(Files[i].fs == fs) {
            Files[i].fs = 0;
        }
    }
}

#endif  /* FF_FS_LOCK != 0 */



/*-----------------------------------------------------------------------*/
/* Move/Flush disk access window in the filesystem object                */
/*-----------------------------------------------------------------------*/
#if !FF_FS_READONLY
static FRESULT sync_window(  /* Returns FR_OK or FR_DISK_ERR */
    FATFS *fs           /* Filesystem object */
)
{
    FRESULT res = FR_OK;


    if(fs->wflag) {     /* Is the disk access window dirty */
        if(disk_write(fs->pdrv, fs->win, fs->winsect, 1) == RES_OK) {   /* Write back the window */
            fs->wflag = 0;  /* Clear window dirty flag */
            if(fs->winsect - fs->fatbase < fs->fsize) {     /* Is it in the 1st FAT? */
                if(fs->n_fats == 2) {
                    disk_write(fs->pdrv, fs->win, fs->winsect + fs->fsize, 1);    /* Reflect it to 2nd FAT if needed */
                }
            }
        } else {
            res = FR_DISK_ERR;
        }
    }
    return res;
}
#endif


static FRESULT move_window(  /* Returns FR_OK or FR_DISK_ERR */
    FATFS *fs,          /* Filesystem object */
    DWORD sector        /* Sector number to make appearance in the fs->win[] */
)
{
    FRESULT res = FR_OK;


    if(sector != fs->winsect) {     /* Window offset changed? */
#if !FF_FS_READONLY
        res = sync_window(fs);      /* Write-back changes */
#endif
        if(res == FR_OK) {          /* Fill sector window with new data */
            if(disk_read(fs->pdrv, fs->win, sector, 1) != RES_OK) {
                sector = 0xFFFFFFFF;    /* Invalidate window if read data is not valid */
                res = FR_DISK_ERR;
            }
            fs->winsect = sector;
        }
    }
    return res;
}




#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Synchronize filesystem and data on the storage                        */
/*-----------------------------------------------------------------------*/

static FRESULT sync_fs(  /* Returns FR_OK or FR_DISK_ERR */
    FATFS *fs       /* Filesystem object */
)
{
    FRESULT res;


    res = sync_window(fs);
    if(res == FR_OK) {
        if(fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) {  /* FAT32: Update FSInfo sector if needed */
            /* Create FSInfo structure */
            mem_set(fs->win, 0, sizeof fs->win);
            st_word(fs->win + BS_55AA, 0xAA55);
            st_dword(fs->win + FSI_LeadSig, 0x41615252);
            st_dword(fs->win + FSI_StrucSig, 0x61417272);
            st_dword(fs->win + FSI_Free_Count, fs->free_clst);
            st_dword(fs->win + FSI_Nxt_Free, fs->last_clst);
            /* Write it into the FSInfo sector */
            fs->winsect = fs->volbase + 1;
            disk_write(fs->pdrv, fs->win, fs->winsect, 1);
            fs->fsi_flag = 0;
        }
        /* Make sure that no pending write process in the lower layer */
        if(disk_ioctl(fs->pdrv, CTRL_SYNC, 0) != RES_OK) {
            res = FR_DISK_ERR;
        }
    }

    return res;
}

#endif



/*-----------------------------------------------------------------------*/
/* Get physical sector number from cluster number                        */
/*-----------------------------------------------------------------------*/

static DWORD clst2sect(  /* !=0:Sector number, 0:Failed (invalid cluster#) */
    FATFS *fs,      /* Filesystem object */
    DWORD clst      /* Cluster# to be converted */
)
{
    clst -= 2;      /* Cluster number is origin from 2 */
    if(clst >= fs->n_fatent - 2) {
        return 0;    /* Is it invalid cluster number? */
    }
    return fs->database + fs->csize * clst;     /* Start sector number of the cluster */
}




/*-----------------------------------------------------------------------*/
/* FAT access - Read value of a FAT entry                                */
/*-----------------------------------------------------------------------*/

static DWORD get_fat(   /* 0xFFFFFFFF:Disk error, 1:Internal error, 2..0x7FFFFFFF:Cluster status */
    FFOBJID *obj,   /* Corresponding object */
    DWORD clst      /* Cluster number to get the value */
)
{
    UINT wc, bc;
    DWORD val;
    FATFS *fs = obj->fs;


    if(clst < 2 || clst >= fs->n_fatent) {  /* Check if in valid range */
        val = 1;    /* Internal error */

    } else {
        val = 0xFFFFFFFF;   /* Default value falls on disk error */

        switch(fs->fs_type) {
        case FS_FAT12 :
            bc = (UINT)clst;
            bc += bc / 2;
            if(move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) {
                break;
            }
            wc = fs->win[bc++ % SS(fs)];        /* Get 1st byte of the entry */
            if(move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) {
                break;
            }
            wc |= fs->win[bc % SS(fs)] << 8;    /* Merge 2nd byte of the entry */
            val = (clst & 1) ? (wc >> 4) : (wc & 0xFFF);    /* Adjust bit position */
            break;

        case FS_FAT16 :
            if(move_window(fs, fs->fatbase + (clst / (SS(fs) / 2))) != FR_OK) {
                break;
            }
            val = ld_word(fs->win + clst * 2 % SS(fs));     /* Simple WORD array */
            break;

        case FS_FAT32 :
            if(move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) {
                break;
            }
            val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x0FFFFFFF;   /* Simple DWORD array but mask out upper 4 bits */
            break;
#if FF_FS_EXFAT
        case FS_EXFAT :
            if((obj->objsize != 0 && obj->sclust != 0) || obj->stat == 0) {     /* Object except root dir must have valid data length */
                DWORD cofs = clst - obj->sclust;    /* Offset from start cluster */
                DWORD clen = (DWORD)((obj->objsize - 1) / SS(fs)) / fs->csize;  /* Number of clusters - 1 */

                if(obj->stat == 2 && cofs <= clen) {    /* Is it a contiguous chain? */
                    val = (cofs == clen) ? 0x7FFFFFFF : clst + 1;   /* No data on the FAT, generate the value */
                    break;
                }
                if(obj->stat == 3 && cofs < obj->n_cont) {  /* Is it in the 1st fragment? */
                    val = clst + 1;     /* Generate the value */
                    break;
                }
                if(obj->stat != 2) {    /* Get value from FAT if FAT chain is valid */
                    if(obj->n_frag != 0) {  /* Is it on the growing edge? */
                        val = 0x7FFFFFFF;   /* Generate EOC */
                    } else {
                        if(move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) {
                            break;
                        }
                        val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x7FFFFFFF;
                    }
                    break;
                }
            }
            /* go to default */
#endif
        default:
            val = 1;    /* Internal error */
        }
    }

    return val;
}




#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT access - Change value of a FAT entry                              */
/*-----------------------------------------------------------------------*/

static FRESULT put_fat(  /* FR_OK(0):succeeded, !=0:error */
    FATFS *fs,      /* Corresponding filesystem object */
    DWORD clst,     /* FAT index number (cluster number) to be changed */
    DWORD val       /* New value to be set to the entry */
)
{
    UINT bc;
    BYTE *p;
    FRESULT res = FR_INT_ERR;


    if(clst >= 2 && clst < fs->n_fatent) {  /* Check if in valid range */
        switch(fs->fs_type) {
        case FS_FAT12 :
            bc = (UINT)clst;
            bc += bc / 2;  /* bc: byte offset of the entry */
            res = move_window(fs, fs->fatbase + (bc / SS(fs)));
            if(res != FR_OK) {
                break;
            }
            p = fs->win + bc++ % SS(fs);
            *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;     /* Put 1st byte */
            fs->wflag = 1;
            res = move_window(fs, fs->fatbase + (bc / SS(fs)));
            if(res != FR_OK) {
                break;
            }
            p = fs->win + bc % SS(fs);
            *p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F)); /* Put 2nd byte */
            fs->wflag = 1;
            break;

        case FS_FAT16 :
            res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
            if(res != FR_OK) {
                break;
            }
            st_word(fs->win + clst * 2 % SS(fs), (WORD)val);    /* Simple WORD array */
            fs->wflag = 1;
            break;

        case FS_FAT32 :
#if FF_FS_EXFAT
        case FS_EXFAT :
#endif
            res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
            if(res != FR_OK) {
                break;
            }
            if(!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {
                val = (val & 0x0FFFFFFF) | (ld_dword(fs->win + clst * 4 % SS(fs)) & 0xF0000000);
            }
            st_dword(fs->win + clst * 4 % SS(fs), val);
            fs->wflag = 1;
            break;
        }
    }
    return res;
}

#endif /* !FF_FS_READONLY */




#if FF_FS_EXFAT && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* exFAT: Accessing FAT and Allocation Bitmap                            */
/*-----------------------------------------------------------------------*/

/*--------------------------------------*/
/* Find a contiguous free cluster block */
/*--------------------------------------*/

static DWORD find_bitmap(  /* 0:Not found, 2..:Cluster block found, 0xFFFFFFFF:Disk error */
    FATFS *fs,  /* Filesystem object */
    DWORD clst, /* Cluster number to scan from */
    DWORD ncl   /* Number of contiguous clusters to find (1..) */
)
{
    BYTE bm, bv;
    UINT i;
    DWORD val, scl, ctr;


    clst -= 2;  /* The first bit in the bitmap corresponds to cluster #2 */
    if(clst >= fs->n_fatent - 2) {
        clst = 0;
    }
    scl = val = clst;
    ctr = 0;
    for(;;) {
        if(move_window(fs, fs->bitbase + val / 8 / SS(fs)) != FR_OK) {
            return 0xFFFFFFFF;
        }
        i = val / 8 % SS(fs);
        bm = 1 << (val % 8);
        do {
            do {
                bv = fs->win[i] & bm;
                bm <<= 1;     /* Get bit value */
                if(++val >= fs->n_fatent - 2) {     /* Next cluster (with wrap-around) */
                    val = 0;
                    bm = 0;
                    i = SS(fs);
                }
                if(bv == 0) {   /* Is it a free cluster? */
                    if(++ctr == ncl) {
                        return scl + 2;    /* Check if run length is sufficient for required */
                    }
                } else {
                    scl = val;
                    ctr = 0;     /* Encountered a cluster in-use, restart to scan */
                }
                if(val == clst) {
                    return 0;    /* All cluster scanned? */
                }
            } while(bm != 0);
            bm = 1;
        } while(++i < SS(fs));
    }
}


/*----------------------------------------*/
/* Set/Clear a block of allocation bitmap */
/*----------------------------------------*/

static FRESULT change_bitmap(
    FATFS *fs,  /* Filesystem object */
    DWORD clst, /* Cluster number to change from */
    DWORD ncl,  /* Number of clusters to be changed */
    int bv      /* bit value to be set (0 or 1) */
)
{
    BYTE bm;
    UINT i;
    DWORD sect;


    clst -= 2;  /* The first bit corresponds to cluster #2 */
    sect = fs->bitbase + clst / 8 / SS(fs); /* Sector address */
    i = clst / 8 % SS(fs);                  /* Byte offset in the sector */
    bm = 1 << (clst % 8);                   /* Bit mask in the byte */
    for(;;) {
        if(move_window(fs, sect++) != FR_OK) {
            return FR_DISK_ERR;
        }
        do {
            do {
                if(bv == (int)((fs->win[i] & bm) != 0)) {
                    return FR_INT_ERR;    /* Is the bit expected value? */
                }
                fs->win[i] ^= bm;   /* Flip the bit */
                fs->wflag = 1;
                if(--ncl == 0) {
                    return FR_OK;    /* All bits processed? */
                }
            } while(bm <<= 1);      /* Next bit */
            bm = 1;
        } while(++i < SS(fs));      /* Next byte */
        i = 0;
    }
}


/*---------------------------------------------*/
/* Fill the first fragment of the FAT chain    */
/*---------------------------------------------*/

static FRESULT fill_first_frag(
    FFOBJID *obj    /* Pointer to the corresponding object */
)
{
    FRESULT res;
    DWORD cl, n;


    if(obj->stat == 3) {    /* Has the object been changed 'fragmented' in this session? */
        for(cl = obj->sclust, n = obj->n_cont; n; cl++, n--) {  /* Create cluster chain on the FAT */
            res = put_fat(obj->fs, cl, cl + 1);
            if(res != FR_OK) {
                return res;
            }
        }
        obj->stat = 0;  /* Change status 'FAT chain is valid' */
    }
    return FR_OK;
}


/*---------------------------------------------*/
/* Fill the last fragment of the FAT chain     */
/*---------------------------------------------*/

static FRESULT fill_last_frag(
    FFOBJID *obj,   /* Pointer to the corresponding object */
    DWORD lcl,      /* Last cluster of the fragment */
    DWORD term      /* Value to set the last FAT entry */
)
{
    FRESULT res;


    while(obj->n_frag > 0) {    /* Create the chain of last fragment */
        res = put_fat(obj->fs, lcl - obj->n_frag + 1, (obj->n_frag > 1) ? lcl - obj->n_frag + 2 : term);
        if(res != FR_OK) {
            return res;
        }
        obj->n_frag--;
    }
    return FR_OK;
}

#endif  /* FF_FS_EXFAT && !FF_FS_READONLY */



#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT handling - Remove a cluster chain                                 */
/*-----------------------------------------------------------------------*/

static FRESULT remove_chain(  /* FR_OK(0):succeeded, !=0:error */
    FFOBJID *obj,       /* Corresponding object */
    DWORD clst,         /* Cluster to remove a chain from */
    DWORD pclst         /* Previous cluster of clst (0 if entire chain) */
)
{
    FRESULT res = FR_OK;
    DWORD nxt;
    FATFS *fs = obj->fs;
#if FF_FS_EXFAT || FF_USE_TRIM
    DWORD scl = clst, ecl = clst;
#endif
#if FF_USE_TRIM
    DWORD rt[2];
#endif

    if(clst < 2 || clst >= fs->n_fatent) {
        return FR_INT_ERR;    /* Check if in valid range */
    }

    /* Mark the previous cluster 'EOC' on the FAT if it exists */
    if(pclst != 0 && (!FF_FS_EXFAT || fs->fs_type != FS_EXFAT || obj->stat != 2)) {
        res = put_fat(fs, pclst, 0xFFFFFFFF);
        if(res != FR_OK) {
            return res;
        }
    }

    /* Remove the chain */
    do {
        nxt = get_fat(obj, clst);           /* Get cluster status */
        if(nxt == 0) {
            break;    /* Empty cluster? */
        }
        if(nxt == 1) {
            return FR_INT_ERR;    /* Internal error? */
        }
        if(nxt == 0xFFFFFFFF) {
            return FR_DISK_ERR;    /* Disk error? */
        }
        if(!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {
            res = put_fat(fs, clst, 0);     /* Mark the cluster 'free' on the FAT */
            if(res != FR_OK) {
                return res;
            }
        }
        if(fs->free_clst < fs->n_fatent - 2) {  /* Update FSINFO */
            fs->free_clst++;
            fs->fsi_flag |= 1;
        }
#if FF_FS_EXFAT || FF_USE_TRIM
        if(ecl + 1 == nxt) {    /* Is next cluster contiguous? */
            ecl = nxt;
        } else {                /* End of contiguous cluster block */
#if FF_FS_EXFAT
            if(fs->fs_type == FS_EXFAT) {
                res = change_bitmap(fs, scl, ecl - scl + 1, 0); /* Mark the cluster block 'free' on the bitmap */
                if(res != FR_OK) {
                    return res;
                }
            }
#endif
#if FF_USE_TRIM
            rt[0] = clst2sect(fs, scl);                 /* Start of data area freed */
            rt[1] = clst2sect(fs, ecl) + fs->csize - 1; /* End of data area freed */
            disk_ioctl(fs->pdrv, CTRL_TRIM, rt);        /* Inform device the data in the block is no longer needed */
#endif
            scl = ecl = nxt;
        }
#endif
        clst = nxt;                 /* Next cluster */
    } while(clst < fs->n_fatent);   /* Repeat while not the last link */

#if FF_FS_EXFAT
    /* Some post processes for chain status */
    if(fs->fs_type == FS_EXFAT) {
        if(pclst == 0) {    /* Has the entire chain been removed? */
            obj->stat = 0;      /* Change the chain status 'initial' */
        } else {
            if(obj->stat == 0) {    /* Is it a fragmented chain from the beginning of this session? */
                clst = obj->sclust;     /* Follow the chain to check if it gets contiguous */
                while(clst != pclst) {
                    nxt = get_fat(obj, clst);
                    if(nxt < 2) {
                        return FR_INT_ERR;
                    }
                    if(nxt == 0xFFFFFFFF) {
                        return FR_DISK_ERR;
                    }
                    if(nxt != clst + 1) {
                        break;    /* Not contiguous? */
                    }
                    clst++;
                }
                if(clst == pclst) {     /* Has the chain got contiguous again? */
                    obj->stat = 2;      /* Change the chain status 'contiguous' */
                }
            } else {
                if(obj->stat == 3 && pclst >= obj->sclust &&
                        pclst <= obj->sclust + obj->n_cont) {  /* Was the chain fragmented in this session and got contiguous again? */
                    obj->stat = 2;  /* Change the chain status 'contiguous' */
                }
            }
        }
    }
#endif
    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* FAT handling - Stretch a chain or Create a new chain                  */
/*-----------------------------------------------------------------------*/

static DWORD create_chain(  /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
    FFOBJID *obj,       /* Corresponding object */
    DWORD clst          /* Cluster# to stretch, 0:Create a new chain */
)
{
    DWORD cs, ncl, scl;
    FRESULT res;
    FATFS *fs = obj->fs;


    if(clst == 0) {     /* Create a new chain */
        scl = fs->last_clst;                /* Suggested cluster to start to find */
        if(scl == 0 || scl >= fs->n_fatent) {
            scl = 1;
        }
    } else {            /* Stretch a chain */
        cs = get_fat(obj, clst);            /* Check the cluster status */
        if(cs < 2) {
            return 1;    /* Test for insanity */
        }
        if(cs == 0xFFFFFFFF) {
            return cs;    /* Test for disk error */
        }
        if(cs < fs->n_fatent) {
            return cs;    /* It is already followed by next cluster */
        }
        scl = clst;                         /* Cluster to start to find */
    }
    if(fs->free_clst == 0) {
        return 0;    /* No free cluster */
    }

#if FF_FS_EXFAT
    if(fs->fs_type == FS_EXFAT) {   /* On the exFAT volume */
        ncl = find_bitmap(fs, scl, 1);              /* Find a free cluster */
        if(ncl == 0 || ncl == 0xFFFFFFFF) {
            return ncl;    /* No free cluster or hard error? */
        }
        res = change_bitmap(fs, ncl, 1, 1);         /* Mark the cluster 'in use' */
        if(res == FR_INT_ERR) {
            return 1;
        }
        if(res == FR_DISK_ERR) {
            return 0xFFFFFFFF;
        }
        if(clst == 0) {                             /* Is it a new chain? */
            obj->stat = 2;                          /* Set status 'contiguous' */
        } else {                                    /* It is a stretched chain */
            if(obj->stat == 2 && ncl != scl + 1) {  /* Is the chain got fragmented? */
                obj->n_cont = scl - obj->sclust;    /* Set size of the contiguous part */
                obj->stat = 3;                      /* Change status 'just fragmented' */
            }
        }
        if(obj->stat != 2) {    /* Is the file non-contiguous? */
            if(ncl == clst + 1) {   /* Is the cluster next to previous one? */
                obj->n_frag = obj->n_frag ? obj->n_frag + 1 : 2;    /* Increment size of last framgent */
            } else {                /* New fragment */
                if(obj->n_frag == 0) {
                    obj->n_frag = 1;
                }
                res = fill_last_frag(obj, clst, ncl);   /* Fill last fragment on the FAT and link it to new one */
                if(res == FR_OK) {
                    obj->n_frag = 1;
                }
            }
        }
    } else
#endif
    { /* On the FAT/FAT32 volume */
        ncl = 0;
        if(scl == clst) {                       /* Stretching an existing chain? */
            ncl = scl + 1;                      /* Test if next cluster is free */
            if(ncl >= fs->n_fatent) {
                ncl = 2;
            }
            cs = get_fat(obj, ncl);             /* Get next cluster status */
            if(cs == 1 || cs == 0xFFFFFFFF) {
                return cs;    /* Test for error */
            }
            if(cs != 0) {                       /* Not free? */
                cs = fs->last_clst;             /* Start at suggested cluster if it is valid */
                if(cs >= 2 && cs < fs->n_fatent) {
                    scl = cs;
                }
                ncl = 0;
            }
        }
        if(ncl == 0) {  /* The new cluster cannot be contiguous and find another fragment */
            ncl = scl;  /* Start cluster */
            for(;;) {
                ncl++;                          /* Next cluster */
                if(ncl >= fs->n_fatent) {       /* Check wrap-around */
                    ncl = 2;
                    if(ncl > scl) {
                        return 0;    /* No free cluster found? */
                    }
                }
                cs = get_fat(obj, ncl);         /* Get the cluster status */
                if(cs == 0) {
                    break;    /* Found a free cluster? */
                }
                if(cs == 1 || cs == 0xFFFFFFFF) {
                    return cs;    /* Test for error */
                }
                if(ncl == scl) {
                    return 0;    /* No free cluster found? */
                }
            }
        }
        res = put_fat(fs, ncl, 0xFFFFFFFF);     /* Mark the new cluster 'EOC' */
        if(res == FR_OK && clst != 0) {
            res = put_fat(fs, clst, ncl);       /* Link it from the previous one if needed */
        }
    }

    if(res == FR_OK) {          /* Update FSINFO if function succeeded. */
        fs->last_clst = ncl;
        if(fs->free_clst <= fs->n_fatent - 2) {
            fs->free_clst--;
        }
        fs->fsi_flag |= 1;
    } else {
        ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;    /* Failed. Generate error status */
    }

    return ncl;     /* Return new cluster number or error status */
}

#endif /* !FF_FS_READONLY */




#if FF_USE_FASTSEEK
/*-----------------------------------------------------------------------*/
/* FAT handling - Convert offset into cluster with link map table        */
/*-----------------------------------------------------------------------*/

static DWORD clmt_clust(  /* <2:Error, >=2:Cluster number */
    FIL *fp,        /* Pointer to the file object */
    FSIZE_t ofs     /* File offset to be converted to cluster# */
)
{
    DWORD cl, ncl, *tbl;
    FATFS *fs = fp->obj.fs;


    tbl = fp->cltbl + 1;    /* Top of CLMT */
    cl = (DWORD)(ofs / SS(fs) / fs->csize); /* Cluster order from top of the file */
    for(;;) {
        ncl = *tbl++;           /* Number of cluters in the fragment */
        if(ncl == 0) {
            return 0;    /* End of table? (error) */
        }
        if(cl < ncl) {
            break;    /* In this fragment? */
        }
        cl -= ncl;
        tbl++;       /* Next fragment */
    }
    return cl + *tbl;   /* Return the cluster number */
}

#endif  /* FF_USE_FASTSEEK */




/*-----------------------------------------------------------------------*/
/* Directory handling - Fill a cluster with zeros                        */
/*-----------------------------------------------------------------------*/

#if !FF_FS_READONLY
static FRESULT dir_clear(  /* Returns FR_OK or FR_DISK_ERR */
    FATFS *fs,      /* Filesystem object */
    DWORD clst      /* Directory table to clear */
)
{
    DWORD sect;
    UINT n, szb;
    BYTE *ibuf;


    if(sync_window(fs) != FR_OK) {
        return FR_DISK_ERR;    /* Flush disk access window */
    }
    sect = clst2sect(fs, clst);     /* Top of the cluster */
    fs->winsect = sect;             /* Set window to top of the cluster */
    mem_set(fs->win, 0, sizeof fs->win);    /* Clear window buffer */
#if FF_USE_LFN == 3     /* Quick table clear by using multi-secter write */
    /* Allocate a temporary buffer */
    for(szb = ((DWORD)fs->csize * SS(fs) >= MAX_MALLOC) ? MAX_MALLOC : fs->csize * SS(fs), ibuf = 0; szb > SS(fs) &&
            (ibuf = ff_memalloc(szb)) == 0; szb /= 2) ;
    if(szb > SS(fs)) {      /* Buffer allocated? */
        mem_set(ibuf, 0, szb);
        szb /= SS(fs);      /* Bytes -> Sectors */
        for(n = 0; n < fs->csize && disk_write(fs->pdrv, ibuf, sect + n, szb) == RES_OK; n += szb) ;    /* Fill the cluster with 0 */
        ff_memfree(ibuf);
    } else
#endif
    {
        ibuf = fs->win;
        szb = 1;    /* Use window buffer (many single-sector writes may take a time) */
        for(n = 0; n < fs->csize && disk_write(fs->pdrv, ibuf, sect + n, szb) == RES_OK; n += szb) ;    /* Fill the cluster with 0 */
    }
    return (n == fs->csize) ? FR_OK : FR_DISK_ERR;
}
#endif  /* !FF_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Directory handling - Set directory index                              */
/*-----------------------------------------------------------------------*/

static FRESULT dir_sdi(  /* FR_OK(0):succeeded, !=0:error */
    DIR *dp,        /* Pointer to directory object */
    DWORD ofs       /* Offset of directory table */
)
{
    DWORD csz, clst;
    FATFS *fs = dp->obj.fs;


    if(ofs >= (DWORD)((FF_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR) || ofs % SZDIRE) {   /* Check range of offset and alignment */
        return FR_INT_ERR;
    }
    dp->dptr = ofs;             /* Set current offset */
    clst = dp->obj.sclust;      /* Table start cluster (0:root) */
    if(clst == 0 && fs->fs_type >= FS_FAT32) {  /* Replace cluster# 0 with root cluster# */
        clst = fs->dirbase;
        if(FF_FS_EXFAT) {
            dp->obj.stat = 0;    /* exFAT: Root dir has an FAT chain */
        }
    }

    if(clst == 0) {     /* Static table (root-directory on the FAT volume) */
        if(ofs / SZDIRE >= fs->n_rootdir) {
            return FR_INT_ERR;    /* Is index out of range? */
        }
        dp->sect = fs->dirbase;

    } else {            /* Dynamic table (sub-directory or root-directory on the FAT32/exFAT volume) */
        csz = (DWORD)fs->csize * SS(fs);    /* Bytes per cluster */
        while(ofs >= csz) {                 /* Follow cluster chain */
            clst = get_fat(&dp->obj, clst);             /* Get next cluster */
            if(clst == 0xFFFFFFFF) {
                return FR_DISK_ERR;    /* Disk error */
            }
            if(clst < 2 || clst >= fs->n_fatent) {
                return FR_INT_ERR;    /* Reached to end of table or internal error */
            }
            ofs -= csz;
        }
        dp->sect = clst2sect(fs, clst);
    }
    dp->clust = clst;                   /* Current cluster# */
    if(dp->sect == 0) {
        return FR_INT_ERR;
    }
    dp->sect += ofs / SS(fs);           /* Sector# of the directory entry */
    dp->dir = fs->win + (ofs % SS(fs)); /* Pointer to the entry in the win[] */

    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Move directory table index next                  */
/*-----------------------------------------------------------------------*/

static FRESULT dir_next(  /* FR_OK(0):succeeded, FR_NO_FILE:End of table, FR_DENIED:Could not stretch */
    DIR *dp,                /* Pointer to the directory object */
    int stretch             /* 0: Do not stretch table, 1: Stretch table if needed */
)
{
    DWORD ofs, clst;
    FATFS *fs = dp->obj.fs;


    ofs = dp->dptr + SZDIRE;    /* Next entry */
    if(ofs >= (DWORD)((FF_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR)) {
        dp->sect = 0;    /* Disable it if the offset reached the max value */
    }
    if(dp->sect == 0) {
        return FR_NO_FILE;    /* Report EOT if it has been disabled */
    }

    if(ofs % SS(fs) == 0) {     /* Sector changed? */
        dp->sect++;             /* Next sector */

        if(dp->clust == 0) {    /* Static table */
            if(ofs / SZDIRE >= fs->n_rootdir) {     /* Report EOT if it reached end of static table */
                dp->sect = 0;
                return FR_NO_FILE;
            }
        } else {                /* Dynamic table */
            if((ofs / SS(fs) & (fs->csize - 1)) == 0) {     /* Cluster changed? */
                clst = get_fat(&dp->obj, dp->clust);        /* Get next cluster */
                if(clst <= 1) {
                    return FR_INT_ERR;    /* Internal error */
                }
                if(clst == 0xFFFFFFFF) {
                    return FR_DISK_ERR;    /* Disk error */
                }
                if(clst >= fs->n_fatent) {                  /* It reached end of dynamic table */
#if !FF_FS_READONLY
                    if(!stretch) {                              /* If no stretch, report EOT */
                        dp->sect = 0;
                        return FR_NO_FILE;
                    }
                    clst = create_chain(&dp->obj, dp->clust);   /* Allocate a cluster */
                    if(clst == 0) {
                        return FR_DENIED;    /* No free cluster */
                    }
                    if(clst == 1) {
                        return FR_INT_ERR;    /* Internal error */
                    }
                    if(clst == 0xFFFFFFFF) {
                        return FR_DISK_ERR;    /* Disk error */
                    }
                    if(dir_clear(fs, clst) != FR_OK) {
                        return FR_DISK_ERR;    /* Clean up the stretched table */
                    }
                    if(FF_FS_EXFAT) {
                        dp->obj.stat |= 4;    /* exFAT: The directory has been stretched */
                    }
#else
                    if(!stretch) {
                        dp->sect = 0;    /* (this line is to suppress compiler warning) */
                    }
                    dp->sect = 0;
                    return FR_NO_FILE;            /* Report EOT */
#endif
                }
                dp->clust = clst;       /* Initialize data for new cluster */
                dp->sect = clst2sect(fs, clst);
            }
        }
    }
    dp->dptr = ofs;                     /* Current entry */
    dp->dir = fs->win + ofs % SS(fs);   /* Pointer to the entry in the win[] */

    return FR_OK;
}




#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Directory handling - Reserve a block of directory entries             */
/*-----------------------------------------------------------------------*/

static FRESULT dir_alloc(  /* FR_OK(0):succeeded, !=0:error */
    DIR *dp,                /* Pointer to the directory object */
    UINT nent               /* Number of contiguous entries to allocate */
)
{
    FRESULT res;
    UINT n;
    FATFS *fs = dp->obj.fs;


    res = dir_sdi(dp, 0);
    if(res == FR_OK) {
        n = 0;
        do {
            res = move_window(fs, dp->sect);
            if(res != FR_OK) {
                break;
            }
#if FF_FS_EXFAT
            if((fs->fs_type == FS_EXFAT) ? (int)((dp->dir[XDIR_Type] & 0x80) == 0) : (int)(dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0)) {
#else
            if(dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0) {
#endif
                if(++n == nent) {
                    break;    /* A block of contiguous free entries is found */
                }
            } else {
                n = 0;                  /* Not a blank entry. Restart to search */
            }
            res = dir_next(dp, 1);
        }
        while(res == FR_OK);  /* Next entry with table stretch enabled */
    }

    if(res == FR_NO_FILE) {
        res = FR_DENIED;    /* No directory entry to allocate */
    }
    return res;
}

#endif  /* !FF_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* FAT: Directory handling - Load/Store start cluster number             */
/*-----------------------------------------------------------------------*/

static DWORD ld_clust(  /* Returns the top cluster value of the SFN entry */
    FATFS *fs,          /* Pointer to the fs object */
    const BYTE *dir     /* Pointer to the key entry */
)
{
    DWORD cl;

    cl = ld_word(dir + DIR_FstClusLO);
    if(fs->fs_type == FS_FAT32) {
        cl |= (DWORD)ld_word(dir + DIR_FstClusHI) << 16;
    }

    return cl;
}


#if !FF_FS_READONLY
static void st_clust(
    FATFS *fs,  /* Pointer to the fs object */
    BYTE *dir,  /* Pointer to the key entry */
    DWORD cl    /* Value to be set */
)
{
    st_word(dir + DIR_FstClusLO, (WORD)cl);
    if(fs->fs_type == FS_FAT32) {
        st_word(dir + DIR_FstClusHI, (WORD)(cl >> 16));
    }
}
#endif



#if FF_USE_LFN
/*--------------------------------------------------------*/
/* FAT-LFN: Compare a part of file name with an LFN entry */
/*--------------------------------------------------------*/

static int cmp_lfn(   /* 1:matched, 0:not matched */
    const WCHAR *lfnbuf,    /* Pointer to the LFN working buffer to be compared */
    BYTE *dir               /* Pointer to the directory entry containing the part of LFN */
)
{
    UINT i, s;
    WCHAR wc, uc;


    if(ld_word(dir + LDIR_FstClusLO) != 0) {
        return 0;    /* Check LDIR_FstClusLO */
    }

    i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;  /* Offset in the LFN buffer */

    for(wc = 1, s = 0; s < 13; s++) {       /* Process all characters in the entry */
        uc = ld_word(dir + LfnOfs[s]);      /* Pick an LFN character */
        if(wc != 0) {
            if(i >= FF_MAX_LFN || ff_wtoupper(uc) != ff_wtoupper(lfnbuf[i++])) {    /* Compare it */
                return 0;                   /* Not matched */
            }
            wc = uc;
        } else {
            if(uc != 0xFFFF) {
                return 0;    /* Check filler */
            }
        }
    }

    if((dir[LDIR_Ord] & LLEF) && wc && lfnbuf[i]) {
        return 0;    /* Last segment matched but different length */
    }

    return 1;       /* The part of LFN matched */
}


#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 || FF_USE_LABEL || FF_FS_EXFAT
/*-----------------------------------------------------*/
/* FAT-LFN: Pick a part of file name from an LFN entry */
/*-----------------------------------------------------*/

static int pick_lfn(  /* 1:succeeded, 0:buffer overflow or invalid LFN entry */
    WCHAR *lfnbuf,      /* Pointer to the LFN working buffer */
    BYTE *dir           /* Pointer to the LFN entry */
)
{
    UINT i, s;
    WCHAR wc, uc;


    if(ld_word(dir + LDIR_FstClusLO) != 0) {
        return 0;    /* Check LDIR_FstClusLO is 0 */
    }

    i = ((dir[LDIR_Ord] & ~LLEF) - 1) * 13; /* Offset in the LFN buffer */

    for(wc = 1, s = 0; s < 13; s++) {       /* Process all characters in the entry */
        uc = ld_word(dir + LfnOfs[s]);      /* Pick an LFN character */
        if(wc != 0) {
            if(i >= FF_MAX_LFN) {
                return 0;    /* Buffer overflow? */
            }
            lfnbuf[i++] = wc = uc;          /* Store it */
        } else {
            if(uc != 0xFFFF) {
                return 0;    /* Check filler */
            }
        }
    }

    if(dir[LDIR_Ord] & LLEF) {              /* Put terminator if it is the last LFN part */
        if(i >= FF_MAX_LFN) {
            return 0;    /* Buffer overflow? */
        }
        lfnbuf[i] = 0;
    }

    return 1;       /* The part of LFN is valid */
}
#endif


#if !FF_FS_READONLY
/*-----------------------------------------*/
/* FAT-LFN: Create an entry of LFN entries */
/*-----------------------------------------*/

static void put_lfn(
    const WCHAR *lfn,   /* Pointer to the LFN */
    BYTE *dir,          /* Pointer to the LFN entry to be created */
    BYTE ord,           /* LFN order (1-20) */
    BYTE sum            /* Checksum of the corresponding SFN */
)
{
    UINT i, s;
    WCHAR wc;


    dir[LDIR_Chksum] = sum;         /* Set checksum */
    dir[LDIR_Attr] = AM_LFN;        /* Set attribute. LFN entry */
    dir[LDIR_Type] = 0;
    st_word(dir + LDIR_FstClusLO, 0);

    i = (ord - 1) * 13;             /* Get offset in the LFN working buffer */
    s = wc = 0;
    do {
        if(wc != 0xFFFF) {
            wc = lfn[i++];    /* Get an effective character */
        }
        st_word(dir + LfnOfs[s], wc);       /* Put it */
        if(wc == 0) {
            wc = 0xFFFF;    /* Padding characters for left locations */
        }
    } while(++s < 13);
    if(wc == 0xFFFF || !lfn[i]) {
        ord |= LLEF;    /* Last LFN part is the start of LFN sequence */
    }
    dir[LDIR_Ord] = ord;            /* Set the LFN order */
}

#endif  /* !FF_FS_READONLY */
#endif  /* FF_USE_LFN */



#if FF_USE_LFN && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT-LFN: Create a Numbered SFN                                        */
/*-----------------------------------------------------------------------*/

static void gen_numname(
    BYTE *dst,          /* Pointer to the buffer to store numbered SFN */
    const BYTE *src,    /* Pointer to SFN */
    const WCHAR *lfn,   /* Pointer to LFN */
    UINT seq            /* Sequence number */
)
{
    BYTE ns[8], c;
    UINT i, j;
    WCHAR wc;
    DWORD sr;


    mem_cpy(dst, src, 11);

    if(seq > 5) {   /* In case of many collisions, generate a hash number instead of sequential number */
        sr = seq;
        while(*lfn) {   /* Create a CRC as hash value */
            wc = *lfn++;
            for(i = 0; i < 16; i++) {
                sr = (sr << 1) + (wc & 1);
                wc >>= 1;
                if(sr & 0x10000) {
                    sr ^= 0x11021;
                }
            }
        }
        seq = (UINT)sr;
    }

    /* itoa (hexdecimal) */
    i = 7;
    do {
        c = (BYTE)((seq % 16) + '0');
        if(c > '9') {
            c += 7;
        }
        ns[i--] = c;
        seq /= 16;
    } while(seq);
    ns[i] = '~';

    /* Append the number to the SFN body */
    for(j = 0; j < i && dst[j] != ' '; j++) {
        if(dbc_1st(dst[j])) {
            if(j == i - 1) {
                break;
            }
            j++;
        }
    }
    do {
        dst[j++] = (i < 8) ? ns[i++] : ' ';
    } while(j < 8);
}
#endif  /* FF_USE_LFN && !FF_FS_READONLY */



#if FF_USE_LFN
/*-----------------------------------------------------------------------*/
/* FAT-LFN: Calculate checksum of an SFN entry                           */
/*-----------------------------------------------------------------------*/

static BYTE sum_sfn(
    const BYTE *dir     /* Pointer to the SFN entry */
)
{
    BYTE sum = 0;
    UINT n = 11;

    do {
        sum = (sum >> 1) + (sum << 7) + *dir++;
    } while(--n);
    return sum;
}

#endif  /* FF_USE_LFN */



#if FF_FS_EXFAT
/*-----------------------------------------------------------------------*/
/* exFAT: Checksum                                                       */
/*-----------------------------------------------------------------------*/

static WORD xdir_sum(  /* Get checksum of the directoly entry block */
    const BYTE *dir     /* Directory entry block to be calculated */
)
{
    UINT i, szblk;
    WORD sum;


    szblk = (dir[XDIR_NumSec] + 1) * SZDIRE;    /* Number of bytes of the entry block */
    for(i = sum = 0; i < szblk; i++) {
        if(i == XDIR_SetSum) {  /* Skip 2-byte sum field */
            i++;
        } else {
            sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + dir[i];
        }
    }
    return sum;
}



static WORD xname_sum(  /* Get check sum (to be used as hash) of the file name */
    const WCHAR *name   /* File name to be calculated */
)
{
    WCHAR chr;
    WORD sum = 0;


    while((chr = *name++) != 0) {
        chr = (WCHAR)ff_wtoupper(chr);      /* File name needs to be up-case converted */
        sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr & 0xFF);
        sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr >> 8);
    }
    return sum;
}


#if !FF_FS_READONLY && FF_USE_MKFS
static DWORD xsum32(  /* Returns 32-bit checksum */
    BYTE  dat,          /* Byte to be calculated (byte-by-byte processing) */
    DWORD sum           /* Previous sum value */
)
{
    sum = ((sum & 1) ? 0x80000000 : 0) + (sum >> 1) + dat;
    return sum;
}
#endif


#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2
/*------------------------------------------------------*/
/* exFAT: Get object information from a directory block */
/*------------------------------------------------------*/

static void get_xfileinfo(
    BYTE *dirb,         /* Pointer to the direcotry entry block 85+C0+C1s */
    FILINFO *fno        /* Buffer to store the extracted file information */
)
{
    WCHAR wc, hs;
    UINT di, si, nc;

    /* Get file name from the entry block */
    si = SZDIRE * 2;    /* 1st C1 entry */
    nc = 0;
    hs = 0;
    di = 0;
    while(nc < dirb[XDIR_NumName]) {
        if(si >= MAXDIRB(FF_MAX_LFN)) {
            di = 0;    /* Truncated directory block? */
            break;
        }
        if((si % SZDIRE) == 0) {
            si += 2;    /* Skip entry type field */
        }
        wc = ld_word(dirb + si);
        si += 2;
        nc++; /* Get a character */
        if(hs == 0 && IsSurrogate(wc)) {    /* Is it a surrogate? */
            hs = wc;
            continue;  /* Get low surrogate */
        }
        wc = put_utf((DWORD)hs << 16 | wc, &fno->fname[di], FF_LFN_BUF - di);   /* Store it in API encoding */
        if(wc == 0) {
            di = 0;    /* Buffer overflow or wrong encoding? */
            break;
        }
        di += wc;
        hs = 0;
    }
    if(hs != 0) {
        di = 0;    /* Broken surrogate pair? */
    }
    if(di == 0) {
        fno->fname[di++] = '?';    /* Inaccessible object name? */
    }
    fno->fname[di] = 0;                     /* Terminate the name */
    fno->altname[0] = 0;                    /* exFAT does not support SFN */

    fno->fattrib = dirb[XDIR_Attr];         /* Attribute */
    fno->fsize = (fno->fattrib & AM_DIR) ? 0 : ld_qword(dirb + XDIR_FileSize);  /* Size */
    fno->ftime = ld_word(dirb + XDIR_ModTime + 0);  /* Time */
    fno->fdate = ld_word(dirb + XDIR_ModTime + 2);  /* Date */
}

#endif  /* FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 */


/*-----------------------------------*/
/* exFAT: Get a directry entry block */
/*-----------------------------------*/

static FRESULT load_xdir(  /* FR_INT_ERR: invalid entry block */
    DIR *dp                 /* Reading direcotry object pointing top of the entry block to load */
)
{
    FRESULT res;
    UINT i, sz_ent;
    BYTE *dirb = dp->obj.fs->dirbuf;    /* Pointer to the on-memory direcotry entry block 85+C0+C1s */


    /* Load file-directory entry */
    res = move_window(dp->obj.fs, dp->sect);
    if(res != FR_OK) {
        return res;
    }
    if(dp->dir[XDIR_Type] != ET_FILEDIR) {
        return FR_INT_ERR;    /* Invalid order */
    }
    mem_cpy(dirb + 0 * SZDIRE, dp->dir, SZDIRE);
    sz_ent = (dirb[XDIR_NumSec] + 1) * SZDIRE;
    if(sz_ent < 3 * SZDIRE || sz_ent > 19 * SZDIRE) {
        return FR_INT_ERR;
    }

    /* Load stream-extension entry */
    res = dir_next(dp, 0);
    if(res == FR_NO_FILE) {
        res = FR_INT_ERR;    /* It cannot be */
    }
    if(res != FR_OK) {
        return res;
    }
    res = move_window(dp->obj.fs, dp->sect);
    if(res != FR_OK) {
        return res;
    }
    if(dp->dir[XDIR_Type] != ET_STREAM) {
        return FR_INT_ERR;    /* Invalid order */
    }
    mem_cpy(dirb + 1 * SZDIRE, dp->dir, SZDIRE);
    if(MAXDIRB(dirb[XDIR_NumName]) > sz_ent) {
        return FR_INT_ERR;
    }

    /* Load file-name entries */
    i = 2 * SZDIRE; /* Name offset to load */
    do {
        res = dir_next(dp, 0);
        if(res == FR_NO_FILE) {
            res = FR_INT_ERR;    /* It cannot be */
        }
        if(res != FR_OK) {
            return res;
        }
        res = move_window(dp->obj.fs, dp->sect);
        if(res != FR_OK) {
            return res;
        }
        if(dp->dir[XDIR_Type] != ET_FILENAME) {
            return FR_INT_ERR;    /* Invalid order */
        }
        if(i < MAXDIRB(FF_MAX_LFN)) {
            mem_cpy(dirb + i, dp->dir, SZDIRE);
        }
    } while((i += SZDIRE) < sz_ent);

    /* Sanity check (do it for only accessible object) */
    if(i <= MAXDIRB(FF_MAX_LFN)) {
        if(xdir_sum(dirb) != ld_word(dirb + XDIR_SetSum)) {
            return FR_INT_ERR;
        }
    }
    return FR_OK;
}


/*------------------------------------------------------------------*/
/* exFAT: Initialize object allocation info with loaded entry block */
/*------------------------------------------------------------------*/

static void init_alloc_info(
    FATFS *fs,      /* Filesystem object */
    FFOBJID *obj    /* Object allocation information to be initialized */
)
{
    obj->sclust = ld_dword(fs->dirbuf + XDIR_FstClus);      /* Start cluster */
    obj->objsize = ld_qword(fs->dirbuf + XDIR_FileSize);    /* Size */
    obj->stat = fs->dirbuf[XDIR_GenFlags] & 2;              /* Allocation status */
    obj->n_frag = 0;                                        /* No last fragment info */
}



#if !FF_FS_READONLY || FF_FS_RPATH != 0
/*------------------------------------------------*/
/* exFAT: Load the object's directory entry block */
/*------------------------------------------------*/

static FRESULT load_obj_xdir(
    DIR *dp,            /* Blank directory object to be used to access containing direcotry */
    const FFOBJID *obj  /* Object with its containing directory information */
)
{
    FRESULT res;

    /* Open object containing directory */
    dp->obj.fs = obj->fs;
    dp->obj.sclust = obj->c_scl;
    dp->obj.stat = (BYTE)obj->c_size;
    dp->obj.objsize = obj->c_size & 0xFFFFFF00;
    dp->obj.n_frag = 0;
    dp->blk_ofs = obj->c_ofs;

    res = dir_sdi(dp, dp->blk_ofs); /* Goto object's entry block */
    if(res == FR_OK) {
        res = load_xdir(dp);        /* Load the object's entry block */
    }
    return res;
}
#endif


#if !FF_FS_READONLY
/*----------------------------------------*/
/* exFAT: Store the directory entry block */
/*----------------------------------------*/

static FRESULT store_xdir(
    DIR *dp             /* Pointer to the direcotry object */
)
{
    FRESULT res;
    UINT nent;
    BYTE *dirb = dp->obj.fs->dirbuf;    /* Pointer to the direcotry entry block 85+C0+C1s */

    /* Create set sum */
    st_word(dirb + XDIR_SetSum, xdir_sum(dirb));
    nent = dirb[XDIR_NumSec] + 1;

    /* Store the direcotry entry block to the directory */
    res = dir_sdi(dp, dp->blk_ofs);
    while(res == FR_OK) {
        res = move_window(dp->obj.fs, dp->sect);
        if(res != FR_OK) {
            break;
        }
        mem_cpy(dp->dir, dirb, SZDIRE);
        dp->obj.fs->wflag = 1;
        if(--nent == 0) {
            break;
        }
        dirb += SZDIRE;
        res = dir_next(dp, 0);
    }
    return (res == FR_OK || res == FR_DISK_ERR) ? res : FR_INT_ERR;
}



/*-------------------------------------------*/
/* exFAT: Create a new directory enrty block */
/*-------------------------------------------*/

static void create_xdir(
    BYTE *dirb,         /* Pointer to the direcotry entry block buffer */
    const WCHAR *lfn    /* Pointer to the object name */
)
{
    UINT i;
    BYTE nc1, nlen;
    WCHAR wc;


    /* Create file-directory and stream-extension entry */
    mem_set(dirb, 0, 2 * SZDIRE);
    dirb[0 * SZDIRE + XDIR_Type] = ET_FILEDIR;
    dirb[1 * SZDIRE + XDIR_Type] = ET_STREAM;

    /* Create file-name entries */
    i = SZDIRE * 2; /* Top of file_name entries */
    nlen = nc1 = 0;
    wc = 1;
    do {
        dirb[i++] = ET_FILENAME;
        dirb[i++] = 0;
        do {    /* Fill name field */
            if(wc != 0 && (wc = lfn[nlen]) != 0) {
                nlen++;    /* Get a character if exist */
            }
            st_word(dirb + i, wc);      /* Store it */
            i += 2;
        } while(i % SZDIRE != 0);
        nc1++;
    } while(lfn[nlen]);     /* Fill next entry if any char follows */

    dirb[XDIR_NumName] = nlen;      /* Set name length */
    dirb[XDIR_NumSec] = 1 + nc1;    /* Set secondary count (C0 + C1s) */
    st_word(dirb + XDIR_NameHash, xname_sum(lfn));  /* Set name hash */
}

#endif  /* !FF_FS_READONLY */
#endif  /* FF_FS_EXFAT */



#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 || FF_USE_LABEL || FF_FS_EXFAT
/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/

#define DIR_READ_FILE(dp) dir_read(dp, 0)
#define DIR_READ_LABEL(dp) dir_read(dp, 1)

static FRESULT dir_read(
    DIR *dp,        /* Pointer to the directory object */
    int vol         /* Filtered by 0:file/directory or 1:volume label */
)
{
    FRESULT res = FR_NO_FILE;
    FATFS *fs = dp->obj.fs;
    BYTE attr, b;
#if FF_USE_LFN
    BYTE ord = 0xFF, sum = 0xFF;
#endif

    while(dp->sect) {
        res = move_window(fs, dp->sect);
        if(res != FR_OK) {
            break;
        }
        b = dp->dir[DIR_Name];  /* Test for the entry type */
        if(b == 0) {
            res = FR_NO_FILE;
            break; /* Reached to end of the directory */
        }
#if FF_FS_EXFAT
        if(fs->fs_type == FS_EXFAT) {   /* On the exFAT volume */
            if(FF_USE_LABEL && vol) {
                if(b == ET_VLABEL) {
                    break;    /* Volume label entry? */
                }
            } else {
                if(b == ET_FILEDIR) {       /* Start of the file entry block? */
                    dp->blk_ofs = dp->dptr; /* Get location of the block */
                    res = load_xdir(dp);    /* Load the entry block */
                    if(res == FR_OK) {
                        dp->obj.attr = fs->dirbuf[XDIR_Attr] & AM_MASK; /* Get attribute */
                    }
                    break;
                }
            }
        } else
#endif
        { /* On the FAT/FAT32 volume */
            dp->obj.attr = attr = dp->dir[DIR_Attr] & AM_MASK;  /* Get attribute */
#if FF_USE_LFN      /* LFN configuration */
            if(b == DDEM || b == '.' || (int)((attr & ~AM_ARC) == AM_VOL) != vol) {     /* An entry without valid data */
                ord = 0xFF;
            } else {
                if(attr == AM_LFN) {            /* An LFN entry is found */
                    if(b & LLEF) {          /* Is it start of an LFN sequence? */
                        sum = dp->dir[LDIR_Chksum];
                        b &= (BYTE)~LLEF;
                        ord = b;
                        dp->blk_ofs = dp->dptr;
                    }
                    /* Check LFN validity and capture it */
                    ord = (b == ord && sum == dp->dir[LDIR_Chksum] && pick_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
                } else {                    /* An SFN entry is found */
                    if(ord != 0 || sum != sum_sfn(dp->dir)) {   /* Is there a valid LFN? */
                        dp->blk_ofs = 0xFFFFFFFF;           /* It has no LFN. */
                    }
                    break;
                }
            }
#else       /* Non LFN configuration */
            if(b != DDEM && b != '.' && attr != AM_LFN && (int)((attr & ~AM_ARC) == AM_VOL) == vol) {   /* Is it a valid entry? */
                break;
            }
#endif
        }
        res = dir_next(dp, 0);      /* Next entry */
        if(res != FR_OK) {
            break;
        }
    }

    if(res != FR_OK) {
        dp->sect = 0;    /* Terminate the read operation on error or EOT */
    }
    return res;
}

#endif  /* FF_FS_MINIMIZE <= 1 || FF_USE_LABEL || FF_FS_RPATH >= 2 */



/*-----------------------------------------------------------------------*/
/* Directory handling - Find an object in the directory                  */
/*-----------------------------------------------------------------------*/

static FRESULT dir_find(  /* FR_OK(0):succeeded, !=0:error */
    DIR *dp                 /* Pointer to the directory object with the file name */
)
{
    FRESULT res;
    FATFS *fs = dp->obj.fs;
    BYTE c;
#if FF_USE_LFN
    BYTE a, ord, sum;
#endif

    res = dir_sdi(dp, 0);           /* Rewind directory object */
    if(res != FR_OK) {
        return res;
    }
#if FF_FS_EXFAT
    if(fs->fs_type == FS_EXFAT) {   /* On the exFAT volume */
        BYTE nc;
        UINT di, ni;
        WORD hash = xname_sum(fs->lfnbuf);      /* Hash value of the name to find */

        while((res = DIR_READ_FILE(dp)) == FR_OK) {     /* Read an item */
#if FF_MAX_LFN < 255
            if(fs->dirbuf[XDIR_NumName] > FF_MAX_LFN) {
                continue;    /* Skip comparison if inaccessible object name */
            }
#endif
            if(ld_word(fs->dirbuf + XDIR_NameHash) != hash) {
                continue;    /* Skip comparison if hash mismatched */
            }
            for(nc = fs->dirbuf[XDIR_NumName], di = SZDIRE * 2, ni = 0; nc; nc--, di += 2, ni++) {  /* Compare the name */
                if((di % SZDIRE) == 0) {
                    di += 2;
                }
                if(ff_wtoupper(ld_word(fs->dirbuf + di)) != ff_wtoupper(fs->lfnbuf[ni])) {
                    break;
                }
            }
            if(nc == 0 && !fs->lfnbuf[ni]) {
                break;    /* Name matched? */
            }
        }
        return res;
    }
#endif
    /* On the FAT/FAT32 volume */
#if FF_USE_LFN
    ord = sum = 0xFF;
    dp->blk_ofs = 0xFFFFFFFF; /* Reset LFN sequence */
#endif
    do {
        res = move_window(fs, dp->sect);
        if(res != FR_OK) {
            break;
        }
        c = dp->dir[DIR_Name];
        if(c == 0) {
            res = FR_NO_FILE;    /* Reached to end of table */
            break;
        }
#if FF_USE_LFN      /* LFN configuration */
        dp->obj.attr = a = dp->dir[DIR_Attr] & AM_MASK;
        if(c == DDEM || ((a & AM_VOL) && a != AM_LFN)) {    /* An entry without valid data */
            ord = 0xFF;
            dp->blk_ofs = 0xFFFFFFFF;   /* Reset LFN sequence */
        } else {
            if(a == AM_LFN) {           /* An LFN entry is found */
                if(!(dp->fn[NSFLAG] & NS_NOLFN)) {
                    if(c & LLEF) {      /* Is it start of LFN sequence? */
                        sum = dp->dir[LDIR_Chksum];
                        c &= (BYTE)~LLEF;
                        ord = c;  /* LFN start order */
                        dp->blk_ofs = dp->dptr; /* Start offset of LFN */
                    }
                    /* Check validity of the LFN entry and compare it with given name */
                    ord = (c == ord && sum == dp->dir[LDIR_Chksum] && cmp_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
                }
            } else {                    /* An SFN entry is found */
                if(ord == 0 && sum == sum_sfn(dp->dir)) {
                    break;    /* LFN matched? */
                }
                if(!(dp->fn[NSFLAG] & NS_LOSS) && !mem_cmp(dp->dir, dp->fn, 11)) {
                    break;    /* SFN matched? */
                }
                ord = 0xFF;
                dp->blk_ofs = 0xFFFFFFFF;   /* Reset LFN sequence */
            }
        }
#else       /* Non LFN configuration */
        dp->obj.attr = dp->dir[DIR_Attr] & AM_MASK;
        if(!(dp->dir[DIR_Attr] & AM_VOL) && !mem_cmp(dp->dir, dp->fn, 11)) {
            break;    /* Is it a valid entry? */
        }
#endif
        res = dir_next(dp, 0);  /* Next entry */
    } while(res == FR_OK);

    return res;
}




#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Register an object to the directory                                   */
/*-----------------------------------------------------------------------*/

static FRESULT dir_register(  /* FR_OK:succeeded, FR_DENIED:no free entry or too many SFN collision, FR_DISK_ERR:disk error */
    DIR *dp                     /* Target directory with object name to be created */
)
{
    FRESULT res;
    FATFS *fs = dp->obj.fs;
#if FF_USE_LFN      /* LFN configuration */
    UINT n, nlen, nent;
    BYTE sn[12], sum;


    if(dp->fn[NSFLAG] & (NS_DOT | NS_NONAME)) {
        return FR_INVALID_NAME;    /* Check name validity */
    }
    for(nlen = 0; fs->lfnbuf[nlen]; nlen++) ;   /* Get lfn length */

#if FF_FS_EXFAT
    if(fs->fs_type == FS_EXFAT) {   /* On the exFAT volume */
        nent = (nlen + 14) / 15 + 2;    /* Number of entries to allocate (85+C0+C1s) */
        res = dir_alloc(dp, nent);      /* Allocate directory entries */
        if(res != FR_OK) {
            return res;
        }
        dp->blk_ofs = dp->dptr - SZDIRE * (nent - 1);   /* Set the allocated entry block offset */

        if(dp->obj.stat & 4) {          /* Has the directory been stretched by new allocation? */
            dp->obj.stat &= ~4;
            res = fill_first_frag(&dp->obj);    /* Fill the first fragment on the FAT if needed */
            if(res != FR_OK) {
                return res;
            }
            res = fill_last_frag(&dp->obj, dp->clust, 0xFFFFFFFF);  /* Fill the last fragment on the FAT if needed */
            if(res != FR_OK) {
                return res;
            }
            if(dp->obj.sclust != 0) {       /* Is it a sub-directory? */
                DIR dj;

                res = load_obj_xdir(&dj, &dp->obj); /* Load the object status */
                if(res != FR_OK) {
                    return res;
                }
                dp->obj.objsize += (DWORD)fs->csize * SS(fs);           /* Increase the directory size by cluster size */
                st_qword(fs->dirbuf + XDIR_FileSize, dp->obj.objsize);  /* Update the allocation status */
                st_qword(fs->dirbuf + XDIR_ValidFileSize, dp->obj.objsize);
                fs->dirbuf[XDIR_GenFlags] = dp->obj.stat | 1;
                res = store_xdir(&dj);              /* Store the object status */
                if(res != FR_OK) {
                    return res;
                }
            }
        }

        create_xdir(fs->dirbuf, fs->lfnbuf);    /* Create on-memory directory block to be written later */
        return FR_OK;
    }
#endif
    /* On the FAT/FAT32 volume */
    mem_cpy(sn, dp->fn, 12);
    if(sn[NSFLAG] & NS_LOSS) {          /* When LFN is out of 8.3 format, generate a numbered name */
        dp->fn[NSFLAG] = NS_NOLFN;      /* Find only SFN */
        for(n = 1; n < 100; n++) {
            gen_numname(dp->fn, sn, fs->lfnbuf, n); /* Generate a numbered name */
            res = dir_find(dp);             /* Check if the name collides with existing SFN */
            if(res != FR_OK) {
                break;
            }
        }
        if(n == 100) {
            return FR_DENIED;    /* Abort if too many collisions */
        }
        if(res != FR_NO_FILE) {
            return res;    /* Abort if the result is other than 'not collided' */
        }
        dp->fn[NSFLAG] = sn[NSFLAG];
    }

    /* Create an SFN with/without LFNs. */
    nent = (sn[NSFLAG] & NS_LFN) ? (nlen + 12) / 13 + 1 : 1;    /* Number of entries to allocate */
    res = dir_alloc(dp, nent);      /* Allocate entries */
    if(res == FR_OK && --nent) {    /* Set LFN entry if needed */
        res = dir_sdi(dp, dp->dptr - nent * SZDIRE);
        if(res == FR_OK) {
            sum = sum_sfn(dp->fn);  /* Checksum value of the SFN tied to the LFN */
            do {                    /* Store LFN entries in bottom first */
                res = move_window(fs, dp->sect);
                if(res != FR_OK) {
                    break;
                }
                put_lfn(fs->lfnbuf, dp->dir, (BYTE)nent, sum);
                fs->wflag = 1;
                res = dir_next(dp, 0);  /* Next entry */
            } while(res == FR_OK && --nent);
        }
    }

#else   /* Non LFN configuration */
    res = dir_alloc(dp, 1);     /* Allocate an entry for SFN */

#endif

    /* Set SFN entry */
    if(res == FR_OK) {
        res = move_window(fs, dp->sect);
        if(res == FR_OK) {
            mem_set(dp->dir, 0, SZDIRE);    /* Clean the entry */
            mem_cpy(dp->dir + DIR_Name, dp->fn, 11);    /* Put SFN */
#if FF_USE_LFN
            dp->dir[DIR_NTres] = dp->fn[NSFLAG] & (NS_BODY | NS_EXT);   /* Put NT flag */
#endif
            fs->wflag = 1;
        }
    }

    return res;
}

#endif /* !FF_FS_READONLY */



#if !FF_FS_READONLY && FF_FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Remove an object from the directory                                   */
/*-----------------------------------------------------------------------*/

static FRESULT dir_remove(  /* FR_OK:Succeeded, FR_DISK_ERR:A disk error */
    DIR *dp                 /* Directory object pointing the entry to be removed */
)
{
    FRESULT res;
    FATFS *fs = dp->obj.fs;
#if FF_USE_LFN      /* LFN configuration */
    DWORD last = dp->dptr;

    res = (dp->blk_ofs == 0xFFFFFFFF) ? FR_OK : dir_sdi(dp, dp->blk_ofs);   /* Goto top of the entry block if LFN is exist */
    if(res == FR_OK) {
        do {
            res = move_window(fs, dp->sect);
            if(res != FR_OK) {
                break;
            }
            if(FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {    /* On the exFAT volume */
                dp->dir[XDIR_Type] &= 0x7F; /* Clear the entry InUse flag. */
            } else {                                    /* On the FAT/FAT32 volume */
                dp->dir[DIR_Name] = DDEM;   /* Mark the entry 'deleted'. */
            }
            fs->wflag = 1;
            if(dp->dptr >= last) {
                break;    /* If reached last entry then all entries of the object has been deleted. */
            }
            res = dir_next(dp, 0);  /* Next entry */
        } while(res == FR_OK);
        if(res == FR_NO_FILE) {
            res = FR_INT_ERR;
        }
    }
#else           /* Non LFN configuration */

    res = move_window(fs, dp->sect);
    if(res == FR_OK) {
        dp->dir[DIR_Name] = DDEM;   /* Mark the entry 'deleted'.*/
        fs->wflag = 1;
    }
#endif

    return res;
}

#endif /* !FF_FS_READONLY && FF_FS_MINIMIZE == 0 */



#if FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2
/*-----------------------------------------------------------------------*/
/* Get file information from directory entry                             */
/*-----------------------------------------------------------------------*/

static void get_fileinfo(
    DIR *dp,            /* Pointer to the directory object */
    FILINFO *fno        /* Pointer to the file information to be filled */
)
{
    UINT si, di;
#if FF_USE_LFN
    WCHAR wc, hs;
    FATFS *fs = dp->obj.fs;
#else
    TCHAR c;
#endif


    fno->fname[0] = 0;          /* Invaidate file info */
    if(dp->sect == 0) {
        return;    /* Exit if read pointer has reached end of directory */
    }

#if FF_USE_LFN      /* LFN configuration */
#if FF_FS_EXFAT
    if(fs->fs_type == FS_EXFAT) {   /* On the exFAT volume */
        get_xfileinfo(fs->dirbuf, fno);
        return;
    } else
#endif
    { /* On the FAT/FAT32 volume */
        if(dp->blk_ofs != 0xFFFFFFFF) {     /* Get LFN if available */
            si = di = hs = 0;
            while(fs->lfnbuf[si] != 0) {
                wc = fs->lfnbuf[si++];      /* Get an LFN character (UTF-16) */
                if(hs == 0 && IsSurrogate(wc)) {    /* Is it a surrogate? */
                    hs = wc;
                    continue;      /* Get low surrogate */
                }
                wc = put_utf((DWORD)hs << 16 | wc, &fno->fname[di], FF_LFN_BUF - di);   /* Store it in UTF-16 or UTF-8 encoding */
                if(wc == 0) {
                    di = 0;    /* Invalid char or buffer overflow? */
                    break;
                }
                di += wc;
                hs = 0;
            }
            if(hs != 0) {
                di = 0;    /* Broken surrogate pair? */
            }
            fno->fname[di] = 0;     /* Terminate the LFN (null string means LFN is invalid) */
        }
    }

    si = di = 0;
    while(si < 11) {        /* Get SFN from SFN entry */
        wc = dp->dir[si++];         /* Get a char */
        if(wc == ' ') {
            continue;    /* Skip padding spaces */
        }
        if(wc == RDDEM) {
            wc = DDEM;    /* Restore replaced DDEM character */
        }
        if(si == 9 && di < FF_SFN_BUF) {
            fno->altname[di++] = '.';    /* Insert a . if extension is exist */
        }
#if FF_LFN_UNICODE >= 1 /* Unicode output */
        if(dbc_1st((BYTE)wc) && si != 8 && si != 11 && dbc_2nd(dp->dir[si])) {  /* Make a DBC if needed */
            wc = wc << 8 | dp->dir[si++];
        }
        wc = ff_oem2uni(wc, CODEPAGE);      /* ANSI/OEM -> Unicode */
        if(wc == 0) {
            di = 0;    /* Wrong char in the current code page? */
            break;
        }
        wc = put_utf(wc, &fno->altname[di], FF_SFN_BUF - di);   /* Store it in Unicode */
        if(wc == 0) {
            di = 0;    /* Buffer overflow? */
            break;
        }
        di += wc;
#else                   /* ANSI/OEM output */
        fno->altname[di++] = (TCHAR)wc; /* Store it without any conversion */
#endif
    }
    fno->altname[di] = 0;   /* Terminate the SFN  (null string means SFN is invalid) */

    if(fno->fname[0] == 0) {    /* If LFN is invalid, altname[] needs to be copied to fname[] */
        if(di == 0) {   /* If LFN and SFN both are invalid, this object is inaccesible */
            fno->fname[di++] = '?';
        } else {
            for(si = di = 0; fno->altname[si]; si++, di++) {    /* Copy altname[] to fname[] with case information */
                wc = (WCHAR)fno->altname[si];
                if(IsUpper(wc) && (dp->dir[DIR_NTres] & ((si >= 9) ? NS_EXT : NS_BODY))) {
                    wc += 0x20;
                }
                fno->fname[di] = (TCHAR)wc;
            }
        }
        fno->fname[di] = 0; /* Terminate the LFN */
        if(!dp->dir[DIR_NTres]) {
            fno->altname[0] = 0;    /* Altname is not needed if neither LFN nor case info is exist. */
        }
    }

#else   /* Non-LFN configuration */
    si = di = 0;
    while(si < 11) {        /* Copy name body and extension */
        c = (TCHAR)dp->dir[si++];
        if(c == ' ') {
            continue;    /* Skip padding spaces */
        }
        if(c == RDDEM) {
            c = DDEM;    /* Restore replaced DDEM character */
        }
        if(si == 9) {
            fno->fname[di++] = '.';    /* Insert a . if extension is exist */
        }
        fno->fname[di++] = c;
    }
    fno->fname[di] = 0;
#endif

    fno->fattrib = dp->dir[DIR_Attr];                   /* Attribute */
    fno->fsize = ld_dword(dp->dir + DIR_FileSize);      /* Size */
    fno->ftime = ld_word(dp->dir + DIR_ModTime + 0);    /* Time */
    fno->fdate = ld_word(dp->dir + DIR_ModTime + 2);    /* Date */
}

#endif /* FF_FS_MINIMIZE <= 1 || FF_FS_RPATH >= 2 */



#if FF_USE_FIND && FF_FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Pattern matching                                                      */
/*-----------------------------------------------------------------------*/

static DWORD get_achar(  /* Get a character and advances ptr */
    const TCHAR **ptr       /* Pointer to pointer to the ANSI/OEM or Unicode string */
)
{
    DWORD chr;


#if FF_USE_LFN && FF_LFN_UNICODE >= 1   /* Unicode input */
    chr = tchar2uni(ptr);
    if(chr == 0xFFFFFFFF) {
        chr = 0;    /* Wrong UTF encoding is recognized as end of the string */
    }
    chr = ff_wtoupper(chr);

#else                                   /* ANSI/OEM input */
    chr = (BYTE) * (*ptr)++;            /* Get a byte */
    if(IsLower(chr)) {
        chr -= 0x20;    /* To upper ASCII char */
    }
#if FF_CODE_PAGE == 0
    if(ExCvt && chr >= 0x80) {
        chr = ExCvt[chr - 0x80];    /* To upper SBCS extended char */
    }
#elif FF_CODE_PAGE < 900
    if(chr >= 0x80) {
        chr = ExCvt[chr - 0x80];    /* To upper SBCS extended char */
    }
#endif
#if FF_CODE_PAGE == 0 || FF_CODE_PAGE >= 900
    if(dbc_1st((BYTE)chr)) {    /* Get DBC 2nd byte if needed */
        chr = dbc_2nd((BYTE) **ptr) ? chr << 8 | (BYTE) * (*ptr)++ : 0;
    }
#endif

#endif
    return chr;
}


static int pattern_matching(  /* 0:not matched, 1:matched */
    const TCHAR *pat,   /* Matching pattern */
    const TCHAR *nam,   /* String to be tested */
    int skip,           /* Number of pre-skip chars (number of ?s) */
    int inf             /* Infinite search (* specified) */
)
{
    const TCHAR *pp, *np;
    DWORD pc, nc;
    int nm, nx;


    while(skip--) {                 /* Pre-skip name chars */
        if(!get_achar(&nam)) {
            return 0;    /* Branch mismatched if less name chars */
        }
    }
    if(*pat == 0 && inf) {
        return 1;    /* (short circuit) */
    }

    do {
        pp = pat;
        np = nam;         /* Top of pattern and name to match */
        for(;;) {
            if(*pp == '?' || *pp == '*') {  /* Wildcard? */
                nm = nx = 0;
                do {                /* Analyze the wildcard block */
                    if(*pp++ == '?') {
                        nm++;
                    } else {
                        nx = 1;
                    }
                } while(*pp == '?' || *pp == '*');
                if(pattern_matching(pp, np, nm, nx)) {
                    return 1;    /* Test new branch (recurs upto number of wildcard blocks in the pattern) */
                }
                nc = *np;
                break;    /* Branch mismatched */
            }
            pc = get_achar(&pp);    /* Get a pattern char */
            nc = get_achar(&np);    /* Get a name char */
            if(pc != nc) {
                break;    /* Branch mismatched? */
            }
            if(pc == 0) {
                return 1;    /* Branch matched? (matched at end of both strings) */
            }
        }
        get_achar(&nam);            /* nam++ */
    } while(inf && nc);             /* Retry until end of name if infinite search is specified */

    return 0;
}

#endif /* FF_USE_FIND && FF_FS_MINIMIZE <= 1 */



/*-----------------------------------------------------------------------*/
/* Pick a top segment and create the object name in directory form       */
/*-----------------------------------------------------------------------*/

static FRESULT create_name(  /* FR_OK: successful, FR_INVALID_NAME: could not create */
    DIR *dp,                    /* Pointer to the directory object */
    const TCHAR **path          /* Pointer to pointer to the segment in the path string */
)
{
#if FF_USE_LFN      /* LFN configuration */
    BYTE b, cf;
    WCHAR wc, *lfn;
    DWORD uc;
    UINT i, ni, si, di;
    const TCHAR *p;


    /* Create LFN into LFN working buffer */
    p = *path;
    lfn = dp->obj.fs->lfnbuf;
    di = 0;
    for(;;) {
        uc = tchar2uni(&p);         /* Get a character */
        if(uc == 0xFFFFFFFF) {
            return FR_INVALID_NAME;    /* Invalid code or UTF decode error */
        }
        if(uc >= 0x10000) {
            lfn[di++] = (WCHAR)(uc >> 16);    /* Store high surrogate if needed */
        }
        wc = (WCHAR)uc;
        if(wc < ' ' || wc == '/' || wc == '\\') {
            break;    /* Break if end of the path or a separator is found */
        }
        if(wc < 0x80 && chk_chr("\"*:<>\?|\x7F", wc)) {
            return FR_INVALID_NAME;    /* Reject illegal characters for LFN */
        }
        if(di >= FF_MAX_LFN) {
            return FR_INVALID_NAME;    /* Reject too long name */
        }
        lfn[di++] = wc;                 /* Store the Unicode character */
    }
    while(*p == '/' || *p == '\\') {
        p++;    /* Skip duplicated separators if exist */
    }
    *path = p;                          /* Return pointer to the next segment */
    cf = (wc < ' ') ? NS_LAST : 0;      /* Set last segment flag if end of the path */

#if FF_FS_RPATH != 0
    if((di == 1 && lfn[di - 1] == '.') ||
            (di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.')) {    /* Is this segment a dot name? */
        lfn[di] = 0;
        for(i = 0; i < 11; i++) {       /* Create dot name for SFN entry */
            dp->fn[i] = (i < di) ? '.' : ' ';
        }
        dp->fn[i] = cf | NS_DOT;        /* This is a dot entry */
        return FR_OK;
    }
#endif
    while(di) {                         /* Snip off trailing spaces and dots if exist */
        wc = lfn[di - 1];
        if(wc != ' ' && wc != '.') {
            break;
        }
        di--;
    }
    lfn[di] = 0;                            /* LFN is created into the working buffer */
    if(di == 0) {
        return FR_INVALID_NAME;    /* Reject null name */
    }

    /* Create SFN in directory form */
    for(si = 0; lfn[si] == ' '; si++) ;     /* Remove leading spaces */
    if(si > 0 || lfn[si] == '.') {
        cf |= NS_LOSS | NS_LFN;    /* Is there any leading space or dot? */
    }
    while(di > 0 && lfn[di - 1] != '.') {
        di--;    /* Find last dot (di<=si: no extension) */
    }

    mem_set(dp->fn, ' ', 11);
    i = b = 0;
    ni = 8;
    for(;;) {
        wc = lfn[si++];                 /* Get an LFN character */
        if(wc == 0) {
            break;    /* Break on end of the LFN */
        }
        if(wc == ' ' || (wc == '.' && si != di)) {  /* Remove embedded spaces and dots */
            cf |= NS_LOSS | NS_LFN;
            continue;
        }

        if(i >= ni || si == di) {       /* End of field? */
            if(ni == 11) {              /* Name extension overflow? */
                cf |= NS_LOSS | NS_LFN;
                break;
            }
            if(si != di) {
                cf |= NS_LOSS | NS_LFN;    /* Name body overflow? */
            }
            if(si > di) {
                break;    /* No name extension? */
            }
            si = di;
            i = 8;
            ni = 11;
            b <<= 2;       /* Enter name extension */
            continue;
        }

        if(wc >= 0x80) {    /* Is this a non-ASCII character? */
            cf |= NS_LFN;   /* LFN entry needs to be created */
#if FF_CODE_PAGE == 0
            if(ExCvt) {     /* At SBCS */
                wc = ff_uni2oem(wc, CODEPAGE);          /* Unicode ==> ANSI/OEM code */
                if(wc & 0x80) {
                    wc = ExCvt[wc & 0x7F];    /* Convert extended character to upper (SBCS) */
                }
            } else {        /* At DBCS */
                wc = ff_uni2oem(ff_wtoupper(wc), CODEPAGE); /* Unicode ==> Upper convert ==> ANSI/OEM code */
            }
#elif FF_CODE_PAGE < 900    /* SBCS cfg */
            wc = ff_uni2oem(wc, CODEPAGE);          /* Unicode ==> ANSI/OEM code */
            if(wc & 0x80) {
                wc = ExCvt[wc & 0x7F];    /* Convert extended character to upper (SBCS) */
            }
#else                       /* DBCS cfg */
            wc = ff_uni2oem(ff_wtoupper(wc), CODEPAGE); /* Unicode ==> Upper convert ==> ANSI/OEM code */
#endif
        }

        if(wc >= 0x100) {               /* Is this a DBC? */
            if(i >= ni - 1) {           /* Field overflow? */
                cf |= NS_LOSS | NS_LFN;
                i = ni;
                continue;       /* Next field */
            }
            dp->fn[i++] = (BYTE)(wc >> 8);  /* Put 1st byte */
        } else {                        /* SBC */
            if(wc == 0 || chk_chr("+,;=[]", wc)) {  /* Replace illegal characters for SFN if needed */
                wc = '_';
                cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
            } else {
                if(IsUpper(wc)) {       /* ASCII upper case? */
                    b |= 2;
                }
                if(IsLower(wc)) {       /* ASCII lower case? */
                    b |= 1;
                    wc -= 0x20;
                }
            }
        }
        dp->fn[i++] = (BYTE)wc;
    }

    if(dp->fn[0] == DDEM) {
        dp->fn[0] = RDDEM;    /* If the first character collides with DDEM, replace it with RDDEM */
    }

    if(ni == 8) {
        b <<= 2;    /* Shift capital flags if no extension */
    }
    if((b & 0x0C) == 0x0C || (b & 0x03) == 0x03) {
        cf |= NS_LFN;    /* LFN entry needs to be created if composite capitals */
    }
    if(!(cf & NS_LFN)) {                /* When LFN is in 8.3 format without extended character, NT flags are created */
        if(b & 0x01) {
            cf |= NS_EXT;    /* NT flag (Extension has small capital letters only) */
        }
        if(b & 0x04) {
            cf |= NS_BODY;    /* NT flag (Body has small capital letters only) */
        }
    }

    dp->fn[NSFLAG] = cf;    /* SFN is created into dp->fn[] */

    return FR_OK;


#else   /* FF_USE_LFN : Non-LFN configuration */
    BYTE c, d, *sfn;
    UINT ni, si, i;
    const char *p;

    /* Create file name in directory form */
    p = *path;
    sfn = dp->fn;
    mem_set(sfn, ' ', 11);
    si = i = 0;
    ni = 8;
#if FF_FS_RPATH != 0
    if(p[si] == '.') {  /* Is this a dot entry? */
        for(;;) {
            c = (BYTE)p[si++];
            if(c != '.' || si >= 3) {
                break;
            }
            sfn[i++] = c;
        }
        if(c != '/' && c != '\\' && c > ' ') {
            return FR_INVALID_NAME;
        }
        *path = p + si;                             /* Return pointer to the next segment */
        sfn[NSFLAG] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;   /* Set last segment flag if end of the path */
        return FR_OK;
    }
#endif
    for(;;) {
        c = (BYTE)p[si++];              /* Get a byte */
        if(c <= ' ') {
            break;    /* Break if end of the path name */
        }
        if(c == '/' || c == '\\') {     /* Break if a separator is found */
            while(p[si] == '/' || p[si] == '\\') {
                si++;    /* Skip duplicated separator if exist */
            }
            break;
        }
        if(c == '.' || i >= ni) {       /* End of body or field overflow? */
            if(ni == 11 || c != '.') {
                return FR_INVALID_NAME;    /* Field overflow or invalid dot? */
            }
            i = 8;
            ni = 11;             /* Enter file extension field */
            continue;
        }
#if FF_CODE_PAGE == 0
        if(ExCvt && c >= 0x80) {        /* Is SBC extended character? */
            c = ExCvt[c & 0x7F];        /* To upper SBC extended character */
        }
#elif FF_CODE_PAGE < 900
        if(c >= 0x80) {                 /* Is SBC extended character? */
            c = ExCvt[c & 0x7F];        /* To upper SBC extended character */
        }
#endif
        if(dbc_1st(c)) {                /* Check if it is a DBC 1st byte */
            d = (BYTE)p[si++];          /* Get 2nd byte */
            if(!dbc_2nd(d) || i >= ni - 1) {
                return FR_INVALID_NAME;    /* Reject invalid DBC */
            }
            sfn[i++] = c;
            sfn[i++] = d;
        } else {                        /* SBC */
            if(chk_chr("\"*+,:;<=>\?[]|\x7F", c)) {
                return FR_INVALID_NAME;    /* Reject illegal chrs for SFN */
            }
            if(IsLower(c)) {
                c -= 0x20;    /* To upper */
            }
            sfn[i++] = c;
        }
    }
    *path = p + si;                     /* Return pointer to the next segment */
    if(i == 0) {
        return FR_INVALID_NAME;    /* Reject nul string */
    }

    if(sfn[0] == DDEM) {
        sfn[0] = RDDEM;    /* If the first character collides with DDEM, replace it with RDDEM */
    }
    sfn[NSFLAG] = (c <= ' ') ? NS_LAST : 0;     /* Set last segment flag if end of the path */

    return FR_OK;
#endif /* FF_USE_LFN */
}




/*-----------------------------------------------------------------------*/
/* Follow a file path                                                    */
/*-----------------------------------------------------------------------*/

static FRESULT follow_path(  /* FR_OK(0): successful, !=0: error code */
    DIR *dp,                    /* Directory object to return last directory and found object */
    const TCHAR *path           /* Full-path string to find a file or directory */
)
{
    FRESULT res;
    BYTE ns;
    FATFS *fs = dp->obj.fs;


#if FF_FS_RPATH != 0
    if(*path != '/' && *path != '\\') {     /* Without heading separator */
        dp->obj.sclust = fs->cdir;              /* Start from current directory */
    } else
#endif
    {                                      /* With heading separator */
        while(*path == '/' || *path == '\\') {
            path++;    /* Strip heading separator */
        }
        dp->obj.sclust = 0;                 /* Start from root directory */
    }
#if FF_FS_EXFAT
    dp->obj.n_frag = 0; /* Invalidate last fragment counter of the object */
#if FF_FS_RPATH != 0
    if(fs->fs_type == FS_EXFAT && dp->obj.sclust) {     /* exFAT: Retrieve the sub-directory's status */
        DIR dj;

        dp->obj.c_scl = fs->cdc_scl;
        dp->obj.c_size = fs->cdc_size;
        dp->obj.c_ofs = fs->cdc_ofs;
        res = load_obj_xdir(&dj, &dp->obj);
        if(res != FR_OK) {
            return res;
        }
        dp->obj.objsize = ld_dword(fs->dirbuf + XDIR_FileSize);
        dp->obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
    }
#endif
#endif

    if((UINT)*path < ' ') {                 /* Null path name is the origin directory itself */
        dp->fn[NSFLAG] = NS_NONAME;
        res = dir_sdi(dp, 0);

    } else {                                /* Follow path */
        for(;;) {
            res = create_name(dp, &path);   /* Get a segment name of the path */
            if(res != FR_OK) {
                break;
            }
            res = dir_find(dp);             /* Find an object with the segment name */
            ns = dp->fn[NSFLAG];
            if(res != FR_OK) {              /* Failed to find the object */
                if(res == FR_NO_FILE) {     /* Object is not found */
                    if(FF_FS_RPATH && (ns & NS_DOT)) {  /* If dot entry is not exist, stay there */
                        if(!(ns & NS_LAST)) {
                            continue;    /* Continue to follow if not last segment */
                        }
                        dp->fn[NSFLAG] = NS_NONAME;
                        res = FR_OK;
                    } else {                            /* Could not find the object */
                        if(!(ns & NS_LAST)) {
                            res = FR_NO_PATH;    /* Adjust error code if not last segment */
                        }
                    }
                }
                break;
            }
            if(ns & NS_LAST) {
                break;    /* Last segment matched. Function completed. */
            }
            /* Get into the sub-directory */
            if(!(dp->obj.attr & AM_DIR)) {      /* It is not a sub-directory and cannot follow */
                res = FR_NO_PATH;
                break;
            }
#if FF_FS_EXFAT
            if(fs->fs_type == FS_EXFAT) {       /* Save containing directory information for next dir */
                dp->obj.c_scl = dp->obj.sclust;
                dp->obj.c_size = ((DWORD)dp->obj.objsize & 0xFFFFFF00) | dp->obj.stat;
                dp->obj.c_ofs = dp->blk_ofs;
                init_alloc_info(fs, &dp->obj);  /* Open next directory */
            } else
#endif
            {
                dp->obj.sclust = ld_clust(fs, fs->win + dp->dptr % SS(fs)); /* Open next directory */
            }
        }
    }

    return res;
}




/*-----------------------------------------------------------------------*/
/* Get logical drive number from path name                               */
/*-----------------------------------------------------------------------*/

static int get_ldnumber(  /* Returns logical drive number (-1:invalid drive number or null pointer) */
    const TCHAR **path      /* Pointer to pointer to the path name */
)
{
    const TCHAR *tp, *tt;
    TCHAR tc;
    int i, vol = -1;
#if FF_STR_VOLUME_ID        /* Find string volume ID */
    const char *sp;
    char c;
#endif

    tt = tp = *path;
    if(!tp) {
        return vol;    /* Invalid path name? */
    }
    do {
        tc = *tt++;
    } while((UINT)tc >= (FF_USE_LFN ? ' ' : '!') && tc != ':');    /* Find a colon in the path */

    if(tc == ':') {     /* DOS/Windows style volume ID? */
        i = FF_VOLUMES;
        if(IsDigit(*tp) && tp + 2 == tt) {  /* Is there a numeric volume ID + colon? */
            i = (int) * tp - '0'; /* Get the LD number */
        }
#if FF_STR_VOLUME_ID == 1   /* Arbitrary string is enabled */
        else {
            i = 0;
            do {
                sp = VolumeStr[i];
                tp = *path;  /* This string volume ID and path name */
                do {    /* Compare the volume ID with path name */
                    c = *sp++;
                    tc = *tp++;
                    if(IsLower(c)) {
                        c -= 0x20;
                    }
                    if(IsLower(tc)) {
                        tc -= 0x20;
                    }
                } while(c && (TCHAR)c == tc);
            } while((c || tp != tt) && ++i < FF_VOLUMES);   /* Repeat for each id until pattern match */
        }
#endif
        if(i < FF_VOLUMES) {    /* If a volume ID is found, get the drive number and strip it */
            vol = i;        /* Drive number */
            *path = tt;     /* Snip the drive prefix off */
        }
        return vol;
    }
#if FF_STR_VOLUME_ID == 2       /* Unix style volume ID is enabled */
    if(*tp == '/') {
        i = 0;
        do {
            sp = VolumeStr[i];
            tp = *path;  /* This string volume ID and path name */
            do {    /* Compare the volume ID with path name */
                c = *sp++;
                tc = *(++tp);
                if(IsLower(c)) {
                    c -= 0x20;
                }
                if(IsLower(tc)) {
                    tc -= 0x20;
                }
            } while(c && (TCHAR)c == tc);
        } while((c || (tc != '/' && (UINT)tc >= (FF_USE_LFN ? ' ' : '!'))) && ++i < FF_VOLUMES);    /* Repeat for each ID until pattern match */
        if(i < FF_VOLUMES) {    /* If a volume ID is found, get the drive number and strip it */
            vol = i;        /* Drive number */
            *path = tp;     /* Snip the drive prefix off */
            return vol;
        }
    }
#endif
    /* No drive prefix is found */
#if FF_FS_RPATH != 0
    vol = CurrVol;  /* Default drive is current drive */
#else
    vol = 0;        /* Default drive is 0 */
#endif
    return vol;     /* Return the default drive */
}




/*-----------------------------------------------------------------------*/
/* Load a sector and check if it is an FAT VBR                           */
/*-----------------------------------------------------------------------*/

static BYTE check_fs(  /* 0:FAT, 1:exFAT, 2:Valid BS but not FAT, 3:Not a BS, 4:Disk error */
    FATFS *fs,          /* Filesystem object */
    DWORD sect          /* Sector# (lba) to load and check if it is an FAT-VBR or not */
)
{
    fs->wflag = 0;
    fs->winsect = 0xFFFFFFFF;        /* Invaidate window */
    if(move_window(fs, sect) != FR_OK) {
        return 4;    /* Load boot record */
    }

    if(ld_word(fs->win + BS_55AA) != 0xAA55) {
        return 3;    /* Check boot record signature (always here regardless of the sector size) */
    }

#if FF_FS_EXFAT
    if(!mem_cmp(fs->win + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11)) {
        return 1;    /* Check if exFAT VBR */
    }
#endif
    if(fs->win[BS_JmpBoot] == 0xE9 || fs->win[BS_JmpBoot] == 0xEB || fs->win[BS_JmpBoot] == 0xE8) {     /* Valid JumpBoot code? */
        if(!mem_cmp(fs->win + BS_FilSysType, "FAT", 3)) {
            return 0;    /* Is it an FAT VBR? */
        }
        if(!mem_cmp(fs->win + BS_FilSysType32, "FAT32", 5)) {
            return 0;    /* Is it an FAT32 VBR? */
        }
    }
    return 2;   /* Valid BS but not FAT */
}




/*-----------------------------------------------------------------------*/
/* Determine logical drive number and mount the volume if needed         */
/*-----------------------------------------------------------------------*/

static FRESULT find_volume(  /* FR_OK(0): successful, !=0: an error occurred */
    const TCHAR **path,         /* Pointer to pointer to the path name (drive number) */
    FATFS **rfs,                /* Pointer to pointer to the found filesystem object */
    BYTE mode                   /* !=0: Check write protection for write access */
)
{
    BYTE fmt, *pt;
    int vol;
    DSTATUS stat;
    DWORD bsect, fasize, tsect, sysect, nclst, szbfat, br[4];
    WORD nrsv;
    FATFS *fs;
    UINT i;


    /* Get logical drive number */
    *rfs = 0;
    vol = get_ldnumber(path);
    if(vol < 0) {
        return FR_INVALID_DRIVE;
    }

    /* Check if the filesystem object is valid or not */
    fs = FatFs[vol];                    /* Get pointer to the filesystem object */
    if(!fs) {
        return FR_NOT_ENABLED;    /* Is the filesystem object available? */
    }
#if FF_FS_REENTRANT
    if(!lock_fs(fs)) {
        return FR_TIMEOUT;    /* Lock the volume */
    }
#endif
    *rfs = fs;                          /* Return pointer to the filesystem object */

    mode &= (BYTE)~FA_READ;             /* Desired access mode, write access or not */
    if(fs->fs_type != 0) {              /* If the volume has been mounted */
        stat = disk_status(fs->pdrv);
        if(!(stat & STA_NOINIT)) {      /* and the physical drive is kept initialized */
            if(!FF_FS_READONLY && mode && (stat & STA_PROTECT)) {   /* Check write protection if needed */
                return FR_WRITE_PROTECTED;
            }
            return FR_OK;               /* The filesystem object is valid */
        }
    }

    /* The filesystem object is not valid. */
    /* Following code attempts to mount the volume. (analyze BPB and initialize the filesystem object) */

    fs->fs_type = 0;                    /* Clear the filesystem object */
    fs->pdrv = LD2PD(vol);              /* Bind the logical drive and a physical drive */
    stat = disk_initialize(fs->pdrv);   /* Initialize the physical drive */
    if(stat & STA_NOINIT) {             /* Check if the initialization succeeded */
        return FR_NOT_READY;            /* Failed to initialize due to no medium or hard error */
    }
    if(!FF_FS_READONLY && mode && (stat & STA_PROTECT)) {  /* Check disk write protection if needed */
        return FR_WRITE_PROTECTED;
    }
#if FF_MAX_SS != FF_MIN_SS              /* Get sector size (multiple sector size cfg only) */
    if(disk_ioctl(fs->pdrv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK) {
        return FR_DISK_ERR;
    }
    if(SS(fs) > FF_MAX_SS || SS(fs) < FF_MIN_SS || (SS(fs) & (SS(fs) - 1))) {
        return FR_DISK_ERR;
    }
#endif

    /* Find an FAT partition on the drive. Supports only generic partitioning rules, FDISK (MBR) and SFD (w/o partition). */
    bsect = 0;
    fmt = check_fs(fs, bsect);          /* Load sector 0 and check if it is an FAT-VBR as SFD */
    if(fmt == 2 || (fmt < 2 && LD2PT(vol) != 0)) {  /* Not an FAT-VBR or forced partition number */
        for(i = 0; i < 4; i++) {        /* Get partition offset */
            pt = fs->win + (MBR_Table + i * SZ_PTE);
            br[i] = pt[PTE_System] ? ld_dword(pt + PTE_StLba) : 0;
        }
        i = LD2PT(vol);                 /* Partition number: 0:auto, 1-4:forced */
        if(i != 0) {
            i--;
        }
        do {                            /* Find an FAT volume */
            bsect = br[i];
            fmt = bsect ? check_fs(fs, bsect) : 3;  /* Check the partition */
        } while(LD2PT(vol) == 0 && fmt >= 2 && ++i < 4);
    }
    if(fmt == 4) {
        return FR_DISK_ERR;    /* An error occured in the disk I/O layer */
    }
    if(fmt >= 2) {
        return FR_NO_FILESYSTEM;    /* No FAT volume is found */
    }

    /* An FAT volume is found (bsect). Following code initializes the filesystem object */

#if FF_FS_EXFAT
    if(fmt == 1) {
        QWORD maxlba;
        DWORD so, cv, bcl;

        for(i = BPB_ZeroedEx; i < BPB_ZeroedEx + 53 && fs->win[i] == 0; i++) ;  /* Check zero filler */
        if(i < BPB_ZeroedEx + 53) {
            return FR_NO_FILESYSTEM;
        }

        if(ld_word(fs->win + BPB_FSVerEx) != 0x100) {
            return FR_NO_FILESYSTEM;    /* Check exFAT version (must be version 1.0) */
        }

        if(1 << fs->win[BPB_BytsPerSecEx] != SS(fs)) {  /* (BPB_BytsPerSecEx must be equal to the physical sector size) */
            return FR_NO_FILESYSTEM;
        }

        maxlba = ld_qword(fs->win + BPB_TotSecEx) + bsect;  /* Last LBA + 1 of the volume */
        if(maxlba >= 0x100000000) {
            return FR_NO_FILESYSTEM;    /* (It cannot be handled in 32-bit LBA) */
        }

        fs->fsize = ld_dword(fs->win + BPB_FatSzEx);    /* Number of sectors per FAT */

        fs->n_fats = fs->win[BPB_NumFATsEx];            /* Number of FATs */
        if(fs->n_fats != 1) {
            return FR_NO_FILESYSTEM;    /* (Supports only 1 FAT) */
        }

        fs->csize = 1 << fs->win[BPB_SecPerClusEx];     /* Cluster size */
        if(fs->csize == 0) {
            return FR_NO_FILESYSTEM;    /* (Must be 1..32768) */
        }

        nclst = ld_dword(fs->win + BPB_NumClusEx);      /* Number of clusters */
        if(nclst > MAX_EXFAT) {
            return FR_NO_FILESYSTEM;    /* (Too many clusters) */
        }
        fs->n_fatent = nclst + 2;

        /* Boundaries and Limits */
        fs->volbase = bsect;
        fs->database = bsect + ld_dword(fs->win + BPB_DataOfsEx);
        fs->fatbase = bsect + ld_dword(fs->win + BPB_FatOfsEx);
        if(maxlba < (QWORD)fs->database + nclst * fs->csize) {
            return FR_NO_FILESYSTEM;    /* (Volume size must not be smaller than the size requiered) */
        }
        fs->dirbase = ld_dword(fs->win + BPB_RootClusEx);

        /* Get bitmap location and check if it is contiguous (implementation assumption) */
        so = i = 0;
        for(;;) {   /* Find the bitmap entry in the root directory (in only first cluster) */
            if(i == 0) {
                if(so >= fs->csize) {
                    return FR_NO_FILESYSTEM;    /* Not found? */
                }
                if(move_window(fs, clst2sect(fs, fs->dirbase) + so) != FR_OK) {
                    return FR_DISK_ERR;
                }
                so++;
            }
            if(fs->win[i] == ET_BITMAP) {
                break;    /* Is it a bitmap entry? */
            }
            i = (i + SZDIRE) % SS(fs);  /* Next entry */
        }
        bcl = ld_dword(fs->win + i + 20);                   /* Bitmap cluster */
        if(bcl < 2 || bcl >= fs->n_fatent) {
            return FR_NO_FILESYSTEM;
        }
        fs->bitbase = fs->database + fs->csize * (bcl - 2); /* Bitmap sector */
        for(;;) {   /* Check if bitmap is contiguous */
            if(move_window(fs, fs->fatbase + bcl / (SS(fs) / 4)) != FR_OK) {
                return FR_DISK_ERR;
            }
            cv = ld_dword(fs->win + bcl % (SS(fs) / 4) * 4);
            if(cv == 0xFFFFFFFF) {
                break;    /* Last link? */
            }
            if(cv != ++bcl) {
                return FR_NO_FILESYSTEM;    /* Fragmented? */
            }
        }

#if !FF_FS_READONLY
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;     /* Initialize cluster allocation information */
#endif
        fmt = FS_EXFAT;         /* FAT sub-type */
    } else
#endif  /* FF_FS_EXFAT */
    {
        if(ld_word(fs->win + BPB_BytsPerSec) != SS(fs)) {
            return FR_NO_FILESYSTEM;    /* (BPB_BytsPerSec must be equal to the physical sector size) */
        }

        fasize = ld_word(fs->win + BPB_FATSz16);        /* Number of sectors per FAT */
        if(fasize == 0) {
            fasize = ld_dword(fs->win + BPB_FATSz32);
        }
        fs->fsize = fasize;

        fs->n_fats = fs->win[BPB_NumFATs];              /* Number of FATs */
        if(fs->n_fats != 1 && fs->n_fats != 2) {
            return FR_NO_FILESYSTEM;    /* (Must be 1 or 2) */
        }
        fasize *= fs->n_fats;                           /* Number of sectors for FAT area */

        fs->csize = fs->win[BPB_SecPerClus];            /* Cluster size */
        if(fs->csize == 0 || (fs->csize & (fs->csize - 1))) {
            return FR_NO_FILESYSTEM;    /* (Must be power of 2) */
        }

        fs->n_rootdir = ld_word(fs->win + BPB_RootEntCnt);  /* Number of root directory entries */
        if(fs->n_rootdir % (SS(fs) / SZDIRE)) {
            return FR_NO_FILESYSTEM;    /* (Must be sector aligned) */
        }

        tsect = ld_word(fs->win + BPB_TotSec16);        /* Number of sectors on the volume */
        if(tsect == 0) {
            tsect = ld_dword(fs->win + BPB_TotSec32);
        }

        nrsv = ld_word(fs->win + BPB_RsvdSecCnt);       /* Number of reserved sectors */
        if(nrsv == 0) {
            return FR_NO_FILESYSTEM;    /* (Must not be 0) */
        }

        /* Determine the FAT sub type */
        sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZDIRE); /* RSV + FAT + DIR */
        if(tsect < sysect) {
            return FR_NO_FILESYSTEM;    /* (Invalid volume size) */
        }
        nclst = (tsect - sysect) / fs->csize;           /* Number of clusters */
        if(nclst == 0) {
            return FR_NO_FILESYSTEM;    /* (Invalid volume size) */
        }
        fmt = 0;
        if(nclst <= MAX_FAT32) {
            fmt = FS_FAT32;
        }
        if(nclst <= MAX_FAT16) {
            fmt = FS_FAT16;
        }
        if(nclst <= MAX_FAT12) {
            fmt = FS_FAT12;
        }
        if(fmt == 0) {
            return FR_NO_FILESYSTEM;
        }

        /* Boundaries and Limits */
        fs->n_fatent = nclst + 2;                       /* Number of FAT entries */
        fs->volbase = bsect;                            /* Volume start sector */
        fs->fatbase = bsect + nrsv;                     /* FAT start sector */
        fs->database = bsect + sysect;                  /* Data start sector */
        if(fmt == FS_FAT32) {
            if(ld_word(fs->win + BPB_FSVer32) != 0) {
                return FR_NO_FILESYSTEM;    /* (Must be FAT32 revision 0.0) */
            }
            if(fs->n_rootdir != 0) {
                return FR_NO_FILESYSTEM;    /* (BPB_RootEntCnt must be 0) */
            }
            fs->dirbase = ld_dword(fs->win + BPB_RootClus32);   /* Root directory start cluster */
            szbfat = fs->n_fatent * 4;                  /* (Needed FAT size) */
        } else {
            if(fs->n_rootdir == 0) {
                return FR_NO_FILESYSTEM;    /* (BPB_RootEntCnt must not be 0) */
            }
            fs->dirbase = fs->fatbase + fasize;         /* Root directory start sector */
            szbfat = (fmt == FS_FAT16) ?                /* (Needed FAT size) */
                     fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
        }
        if(fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs)) {
            return FR_NO_FILESYSTEM;    /* (BPB_FATSz must not be less than the size needed) */
        }

#if !FF_FS_READONLY
        /* Get FSInfo if available */
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;     /* Initialize cluster allocation information */
        fs->fsi_flag = 0x80;
#if (FF_FS_NOFSINFO & 3) != 3
        if(fmt == FS_FAT32              /* Allow to update FSInfo only if BPB_FSInfo32 == 1 */
                && ld_word(fs->win + BPB_FSInfo32) == 1
                && move_window(fs, bsect + 1) == FR_OK) {
            fs->fsi_flag = 0;
            if(ld_word(fs->win + BS_55AA) == 0xAA55     /* Load FSInfo data if available */
                    && ld_dword(fs->win + FSI_LeadSig) == 0x41615252
                    && ld_dword(fs->win + FSI_StrucSig) == 0x61417272) {
#if (FF_FS_NOFSINFO & 1) == 0
                fs->free_clst = ld_dword(fs->win + FSI_Free_Count);
#endif
#if (FF_FS_NOFSINFO & 2) == 0
                fs->last_clst = ld_dword(fs->win + FSI_Nxt_Free);
#endif
            }
        }
#endif  /* (FF_FS_NOFSINFO & 3) != 3 */
#endif  /* !FF_FS_READONLY */
    }

    fs->fs_type = fmt;      /* FAT sub-type */
    fs->id = ++Fsid;        /* Volume mount ID */
#if FF_USE_LFN == 1
    fs->lfnbuf = LfnBuf;    /* Static LFN working buffer */
#if FF_FS_EXFAT
    fs->dirbuf = DirBuf;    /* Static directory block scratchpad buuffer */
#endif
#endif
#if FF_FS_RPATH != 0
    fs->cdir = 0;           /* Initialize current directory */
#endif
#if FF_FS_LOCK != 0         /* Clear file lock semaphores */
    clear_lock(fs);
#endif
    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Check if the file/directory object is valid or not                    */
/*-----------------------------------------------------------------------*/

static FRESULT validate(  /* Returns FR_OK or FR_INVALID_OBJECT */
    FFOBJID *obj,           /* Pointer to the FFOBJID, the 1st member in the FIL/DIR object, to check validity */
    FATFS **rfs             /* Pointer to pointer to the owner filesystem object to return */
)
{
    FRESULT res = FR_INVALID_OBJECT;


    if(obj && obj->fs && obj->fs->fs_type && obj->id == obj->fs->id) {  /* Test if the object is valid */
#if FF_FS_REENTRANT
        if(lock_fs(obj->fs)) {  /* Obtain the filesystem object */
            if(!(disk_status(obj->fs->pdrv) & STA_NOINIT)) {  /* Test if the phsical drive is kept initialized */
                res = FR_OK;
            } else {
                unlock_fs(obj->fs, FR_OK);
            }
        } else {
            res = FR_TIMEOUT;
        }
#else
        if(!(disk_status(obj->fs->pdrv) & STA_NOINIT)) {  /* Test if the phsical drive is kept initialized */
            res = FR_OK;
        }
#endif
    }
    *rfs = (res == FR_OK) ? obj->fs : 0;    /* Corresponding filesystem object */
    return res;
}




/*---------------------------------------------------------------------------

   Public Functions (FatFs API)

----------------------------------------------------------------------------*/



/*-----------------------------------------------------------------------*/
/* Mount/Unmount a Logical Drive                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_mount(
    FATFS *fs,          /* Pointer to the filesystem object (NULL:unmount)*/
    const TCHAR *path,  /* Logical drive number to be mounted/unmounted */
    BYTE opt            /* Mode option 0:Do not mount (delayed mount), 1:Mount immediately */
)
{
    FATFS *cfs;
    int vol;
    FRESULT res;
    const TCHAR *rp = path;


    /* Get logical drive number */
    vol = get_ldnumber(&rp);
    if(vol < 0) {
        return FR_INVALID_DRIVE;
    }
    cfs = FatFs[vol];                   /* Pointer to fs object */

    if(cfs) {
#if FF_FS_LOCK != 0
        clear_lock(cfs);
#endif
#if FF_FS_REENTRANT                     /* Discard sync object of the current volume */
        if(!ff_del_syncobj(cfs->sobj)) {
            return FR_INT_ERR;
        }
#endif
        cfs->fs_type = 0;               /* Clear old fs object */
    }

    if(fs) {
        fs->fs_type = 0;                /* Clear new fs object */
#if FF_FS_REENTRANT                     /* Create sync object for the new volume */
        if(!ff_cre_syncobj((BYTE)vol, &fs->sobj)) {
            return FR_INT_ERR;
        }
#endif
    }
    FatFs[vol] = fs;                    /* Register new fs object */

    if(opt == 0) {
        return FR_OK;    /* Do not mount now, it will be mounted later */
    }

    res = find_volume(&path, &fs, 0);   /* Force mounted the volume */
    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Open or Create a File                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_open(
    FIL *fp,            /* Pointer to the blank file object */
    const TCHAR *path,  /* Pointer to the file name */
    BYTE mode           /* Access mode and file open mode flags */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
#if !FF_FS_READONLY
    DWORD dw, cl, bcs, clst, sc;
    FSIZE_t ofs;
#endif
    DEF_NAMBUF


    if(!fp) {
        return FR_INVALID_OBJECT;
    }

    /* Get logical drive number */
    mode &= FF_FS_READONLY ? FA_READ : FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_CREATE_NEW | FA_OPEN_ALWAYS | FA_OPEN_APPEND;
    res = find_volume(&path, &fs, mode);
    if(res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);   /* Follow the file path */
#if !FF_FS_READONLY /* Read/Write configuration */
        if(res == FR_OK) {
            if(dj.fn[NSFLAG] & NS_NONAME) {     /* Origin directory itself? */
                res = FR_INVALID_NAME;
            }
#if FF_FS_LOCK != 0
            else {
                res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);     /* Check if the file can be used */
            }
#endif
        }
        /* Create or Open a file */
        if(mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
            if(res != FR_OK) {                  /* No file, create new */
                if(res == FR_NO_FILE) {         /* There is no file to open, create a new entry */
#if FF_FS_LOCK != 0
                    res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
#else
                    res = dir_register(&dj);
#endif
                }
                mode |= FA_CREATE_ALWAYS;       /* File is created */
            } else {                            /* Any object with the same name is already existing */
                if(dj.obj.attr & (AM_RDO | AM_DIR)) {   /* Cannot overwrite it (R/O or DIR) */
                    res = FR_DENIED;
                } else {
                    if(mode & FA_CREATE_NEW) {
                        res = FR_EXIST;    /* Cannot create as new file */
                    }
                }
            }
            if(res == FR_OK && (mode & FA_CREATE_ALWAYS)) {     /* Truncate the file if overwrite mode */
#if FF_FS_EXFAT
                if(fs->fs_type == FS_EXFAT) {
                    /* Get current allocation info */
                    fp->obj.fs = fs;
                    init_alloc_info(fs, &fp->obj);
                    /* Set directory entry block initial state */
                    mem_set(fs->dirbuf + 2, 0, 30);     /* Clear 85 entry except for NumSec */
                    mem_set(fs->dirbuf + 38, 0, 26);    /* Clear C0 entry except for NumName and NameHash */
                    fs->dirbuf[XDIR_Attr] = AM_ARC;
                    st_dword(fs->dirbuf + XDIR_CrtTime, GET_FATTIME());
                    fs->dirbuf[XDIR_GenFlags] = 1;
                    res = store_xdir(&dj);
                    if(res == FR_OK && fp->obj.sclust != 0) {   /* Remove the cluster chain if exist */
                        res = remove_chain(&fp->obj, fp->obj.sclust, 0);
                        fs->last_clst = fp->obj.sclust - 1;     /* Reuse the cluster hole */
                    }
                } else
#endif
                {
                    /* Set directory entry initial state */
                    cl = ld_clust(fs, dj.dir);          /* Get current cluster chain */
                    st_dword(dj.dir + DIR_CrtTime, GET_FATTIME());  /* Set created time */
                    dj.dir[DIR_Attr] = AM_ARC;          /* Reset attribute */
                    st_clust(fs, dj.dir, 0);            /* Reset file allocation info */
                    st_dword(dj.dir + DIR_FileSize, 0);
                    fs->wflag = 1;
                    if(cl != 0) {                       /* Remove the cluster chain if exist */
                        dw = fs->winsect;
                        res = remove_chain(&dj.obj, cl, 0);
                        if(res == FR_OK) {
                            res = move_window(fs, dw);
                            fs->last_clst = cl - 1;     /* Reuse the cluster hole */
                        }
                    }
                }
            }
        } else { /* Open an existing file */
            if(res == FR_OK) {                  /* Is the object exsiting? */
                if(dj.obj.attr & AM_DIR) {      /* File open against a directory */
                    res = FR_NO_FILE;
                } else {
                    if((mode & FA_WRITE) && (dj.obj.attr & AM_RDO)) {  /* Write mode open against R/O file */
                        res = FR_DENIED;
                    }
                }
            }
        }
        if(res == FR_OK) {
            if(mode & FA_CREATE_ALWAYS) {
                mode |= FA_MODIFIED;    /* Set file change flag if created or overwritten */
            }
            fp->dir_sect = fs->winsect;         /* Pointer to the directory entry */
            fp->dir_ptr = dj.dir;
#if FF_FS_LOCK != 0
            fp->obj.lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);  /* Lock the file for this session */
            if(fp->obj.lockid == 0) {
                res = FR_INT_ERR;
            }
#endif
        }
#else       /* R/O configuration */
        if(res == FR_OK) {
            if(dj.fn[NSFLAG] & NS_NONAME) {     /* Is it origin directory itself? */
                res = FR_INVALID_NAME;
            } else {
                if(dj.obj.attr & AM_DIR) {      /* Is it a directory? */
                    res = FR_NO_FILE;
                }
            }
        }
#endif

        if(res == FR_OK) {
#if FF_FS_EXFAT
            if(fs->fs_type == FS_EXFAT) {
                fp->obj.c_scl = dj.obj.sclust;                          /* Get containing directory info */
                fp->obj.c_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
                fp->obj.c_ofs = dj.blk_ofs;
                init_alloc_info(fs, &fp->obj);
            } else
#endif
            {
                fp->obj.sclust = ld_clust(fs, dj.dir);                  /* Get object allocation info */
                fp->obj.objsize = ld_dword(dj.dir + DIR_FileSize);
            }
#if FF_USE_FASTSEEK
            fp->cltbl = 0;          /* Disable fast seek mode */
#endif
            fp->obj.fs = fs;        /* Validate the file object */
            fp->obj.id = fs->id;
            fp->flag = mode;        /* Set file access mode */
            fp->err = 0;            /* Clear error flag */
            fp->sect = 0;           /* Invalidate current data sector */
            fp->fptr = 0;           /* Set file pointer top of the file */
#if !FF_FS_READONLY
#if !FF_FS_TINY
            mem_set(fp->buf, 0, sizeof fp->buf);    /* Clear sector buffer */
#endif
            if((mode & FA_SEEKEND) && fp->obj.objsize > 0) {    /* Seek to end of file if FA_OPEN_APPEND is specified */
                fp->fptr = fp->obj.objsize;         /* Offset to seek */
                bcs = (DWORD)fs->csize * SS(fs);    /* Cluster size in byte */
                clst = fp->obj.sclust;              /* Follow the cluster chain */
                for(ofs = fp->obj.objsize; res == FR_OK && ofs > bcs; ofs -= bcs) {
                    clst = get_fat(&fp->obj, clst);
                    if(clst <= 1) {
                        res = FR_INT_ERR;
                    }
                    if(clst == 0xFFFFFFFF) {
                        res = FR_DISK_ERR;
                    }
                }
                fp->clust = clst;
                if(res == FR_OK && ofs % SS(fs)) {  /* Fill sector buffer if not on the sector boundary */
                    if((sc = clst2sect(fs, clst)) == 0) {
                        res = FR_INT_ERR;
                    } else {
                        fp->sect = sc + (DWORD)(ofs / SS(fs));
#if !FF_FS_TINY
                        if(disk_read(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
                            res = FR_DISK_ERR;
                        }
#endif
                    }
                }
            }
#endif
        }

        FREE_NAMBUF();
    }

    if(res != FR_OK) {
        fp->obj.fs = 0;    /* Invalidate file object on error */
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Read File                                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_read(
    FIL *fp,    /* Pointer to the file object */
    void *buff, /* Pointer to data buffer */
    UINT btr,   /* Number of bytes to read */
    UINT *br    /* Pointer to number of bytes read */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD clst, sect;
    FSIZE_t remain;
    UINT rcnt, cc, csect;
    BYTE *rbuff = (BYTE *)buff;


    *br = 0;    /* Clear read byte counter */
    res = validate(&fp->obj, &fs);              /* Check validity of the file object */
    if(res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) {
        LEAVE_FF(fs, res);    /* Check validity */
    }
    if(!(fp->flag & FA_READ)) {
        LEAVE_FF(fs, FR_DENIED);    /* Check access mode */
    }
    remain = fp->obj.objsize - fp->fptr;
    if(btr > remain) {
        btr = (UINT)remain;    /* Truncate btr by remaining bytes */
    }

    for(;  btr;                                  /* Repeat until btr bytes read */
            btr -= rcnt, *br += rcnt, rbuff += rcnt, fp->fptr += rcnt) {
        if(fp->fptr % SS(fs) == 0) {            /* On the sector boundary? */
            csect = (UINT)(fp->fptr / SS(fs) & (fs->csize - 1));    /* Sector offset in the cluster */
            if(csect == 0) {                    /* On the cluster boundary? */
                if(fp->fptr == 0) {             /* On the top of the file? */
                    clst = fp->obj.sclust;      /* Follow cluster chain from the origin */
                } else {                        /* Middle or end of the file */
#if FF_USE_FASTSEEK
                    if(fp->cltbl) {
                        clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
                    } else
#endif
                    {
                        clst = get_fat(&fp->obj, fp->clust);    /* Follow cluster chain on the FAT */
                    }
                }
                if(clst < 2) {
                    ABORT(fs, FR_INT_ERR);
                }
                if(clst == 0xFFFFFFFF) {
                    ABORT(fs, FR_DISK_ERR);
                }
                fp->clust = clst;               /* Update current cluster */
            }
            sect = clst2sect(fs, fp->clust);    /* Get current sector */
            if(sect == 0) {
                ABORT(fs, FR_INT_ERR);
            }
            sect += csect;
            cc = btr / SS(fs);                  /* When remaining bytes >= sector size, */
            if(cc > 0) {                        /* Read maximum contiguous sectors directly */
                if(csect + cc > fs->csize) {    /* Clip at cluster boundary */
                    cc = fs->csize - csect;
                }
                if(disk_read(fs->pdrv, rbuff, sect, cc) != RES_OK) {
                    ABORT(fs, FR_DISK_ERR);
                }
#if !FF_FS_READONLY && FF_FS_MINIMIZE <= 2      /* Replace one of the read sectors with cached data if it contains a dirty sector */
#if FF_FS_TINY
                if(fs->wflag && fs->winsect - sect < cc) {
                    mem_cpy(rbuff + ((fs->winsect - sect) * SS(fs)), fs->win, SS(fs));
                }
#else
                if((fp->flag & FA_DIRTY) && fp->sect - sect < cc) {
                    mem_cpy(rbuff + ((fp->sect - sect) * SS(fs)), fp->buf, SS(fs));
                }
#endif
#endif
                rcnt = SS(fs) * cc;             /* Number of bytes transferred */
                continue;
            }
#if !FF_FS_TINY
            if(fp->sect != sect) {          /* Load data sector if not in cache */
#if !FF_FS_READONLY
                if(fp->flag & FA_DIRTY) {       /* Write-back dirty sector cache */
                    if(disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
                        ABORT(fs, FR_DISK_ERR);
                    }
                    fp->flag &= (BYTE)~FA_DIRTY;
                }
#endif
                if(disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) {
                    ABORT(fs, FR_DISK_ERR);    /* Fill sector cache */
                }
            }
#endif
            fp->sect = sect;
        }
        rcnt = SS(fs) - (UINT)fp->fptr % SS(fs);    /* Number of bytes left in the sector */
        if(rcnt > btr) {
            rcnt = btr;    /* Clip it by btr if needed */
        }
#if FF_FS_TINY
        if(move_window(fs, fp->sect) != FR_OK) {
            ABORT(fs, FR_DISK_ERR);    /* Move sector window */
        }
        mem_cpy(rbuff, fs->win + fp->fptr % SS(fs), rcnt);  /* Extract partial sector */
#else
        mem_cpy(rbuff, fp->buf + fp->fptr % SS(fs), rcnt);  /* Extract partial sector */
#endif
    }

    LEAVE_FF(fs, FR_OK);
}




#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Write File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_write(
    FIL *fp,            /* Pointer to the file object */
    const void *buff,   /* Pointer to the data to be written */
    UINT btw,           /* Number of bytes to write */
    UINT *bw            /* Pointer to number of bytes written */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD clst, sect;
    UINT wcnt, cc, csect;
    const BYTE *wbuff = (const BYTE *)buff;


    *bw = 0;    /* Clear write byte counter */
    res = validate(&fp->obj, &fs);          /* Check validity of the file object */
    if(res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) {
        LEAVE_FF(fs, res);    /* Check validity */
    }
    if(!(fp->flag & FA_WRITE)) {
        LEAVE_FF(fs, FR_DENIED);    /* Check access mode */
    }

    /* Check fptr wrap-around (file size cannot reach 4 GiB at FAT volume) */
    if((!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) && (DWORD)(fp->fptr + btw) < (DWORD)fp->fptr) {
        btw = (UINT)(0xFFFFFFFF - (DWORD)fp->fptr);
    }

    for(;  btw;                              /* Repeat until all data written */
            btw -= wcnt, *bw += wcnt, wbuff += wcnt, fp->fptr += wcnt, fp->obj.objsize = (fp->fptr > fp->obj.objsize) ? fp->fptr : fp->obj.objsize) {
        if(fp->fptr % SS(fs) == 0) {        /* On the sector boundary? */
            csect = (UINT)(fp->fptr / SS(fs)) & (fs->csize - 1);    /* Sector offset in the cluster */
            if(csect == 0) {                /* On the cluster boundary? */
                if(fp->fptr == 0) {         /* On the top of the file? */
                    clst = fp->obj.sclust;  /* Follow from the origin */
                    if(clst == 0) {         /* If no cluster is allocated, */
                        clst = create_chain(&fp->obj, 0);   /* create a new cluster chain */
                    }
                } else {                    /* On the middle or end of the file */
#if FF_USE_FASTSEEK
                    if(fp->cltbl) {
                        clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
                    } else
#endif
                    {
                        clst = create_chain(&fp->obj, fp->clust);   /* Follow or stretch cluster chain on the FAT */
                    }
                }
                if(clst == 0) {
                    break;    /* Could not allocate a new cluster (disk full) */
                }
                if(clst == 1) {
                    ABORT(fs, FR_INT_ERR);
                }
                if(clst == 0xFFFFFFFF) {
                    ABORT(fs, FR_DISK_ERR);
                }
                fp->clust = clst;           /* Update current cluster */
                if(fp->obj.sclust == 0) {
                    fp->obj.sclust = clst;    /* Set start cluster if the first write */
                }
            }
#if FF_FS_TINY
            if(fs->winsect == fp->sect && sync_window(fs) != FR_OK) {
                ABORT(fs, FR_DISK_ERR);    /* Write-back sector cache */
            }
#else
            if(fp->flag & FA_DIRTY) {       /* Write-back sector cache */
                if(disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
                    ABORT(fs, FR_DISK_ERR);
                }
                fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            sect = clst2sect(fs, fp->clust);    /* Get current sector */
            if(sect == 0) {
                ABORT(fs, FR_INT_ERR);
            }
            sect += csect;
            cc = btw / SS(fs);              /* When remaining bytes >= sector size, */
            if(cc > 0) {                    /* Write maximum contiguous sectors directly */
                if(csect + cc > fs->csize) {    /* Clip at cluster boundary */
                    cc = fs->csize - csect;
                }
                if(disk_write(fs->pdrv, wbuff, sect, cc) != RES_OK) {
                    ABORT(fs, FR_DISK_ERR);
                }
#if FF_FS_MINIMIZE <= 2
#if FF_FS_TINY
                if(fs->winsect - sect < cc) {   /* Refill sector cache if it gets invalidated by the direct write */
                    mem_cpy(fs->win, wbuff + ((fs->winsect - sect) * SS(fs)), SS(fs));
                    fs->wflag = 0;
                }
#else
                if(fp->sect - sect < cc) {  /* Refill sector cache if it gets invalidated by the direct write */
                    mem_cpy(fp->buf, wbuff + ((fp->sect - sect) * SS(fs)), SS(fs));
                    fp->flag &= (BYTE)~FA_DIRTY;
                }
#endif
#endif
                wcnt = SS(fs) * cc;     /* Number of bytes transferred */
                continue;
            }
#if FF_FS_TINY
            if(fp->fptr >= fp->obj.objsize) {   /* Avoid silly cache filling on the growing edge */
                if(sync_window(fs) != FR_OK) {
                    ABORT(fs, FR_DISK_ERR);
                }
                fs->winsect = sect;
            }
#else
            if(fp->sect != sect &&          /* Fill sector cache with file data */
                    fp->fptr < fp->obj.objsize &&
                    disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) {
                ABORT(fs, FR_DISK_ERR);
            }
#endif
            fp->sect = sect;
        }
        wcnt = SS(fs) - (UINT)fp->fptr % SS(fs);    /* Number of bytes left in the sector */
        if(wcnt > btw) {
            wcnt = btw;    /* Clip it by btw if needed */
        }
#if FF_FS_TINY
        if(move_window(fs, fp->sect) != FR_OK) {
            ABORT(fs, FR_DISK_ERR);    /* Move sector window */
        }
        mem_cpy(fs->win + fp->fptr % SS(fs), wbuff, wcnt);  /* Fit data to the sector */
        fs->wflag = 1;
#else
        mem_cpy(fp->buf + fp->fptr % SS(fs), wbuff, wcnt);  /* Fit data to the sector */
        fp->flag |= FA_DIRTY;
#endif
    }

    fp->flag |= FA_MODIFIED;                /* Set file change flag */

    LEAVE_FF(fs, FR_OK);
}




/*-----------------------------------------------------------------------*/
/* Synchronize the File                                                  */
/*-----------------------------------------------------------------------*/

FRESULT f_sync(
    FIL *fp     /* Pointer to the file object */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD tm;
    BYTE *dir;


    res = validate(&fp->obj, &fs);  /* Check validity of the file object */
    if(res == FR_OK) {
        if(fp->flag & FA_MODIFIED) {    /* Is there any change to the file? */
#if !FF_FS_TINY
            if(fp->flag & FA_DIRTY) {   /* Write-back cached data if needed */
                if(disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
                    LEAVE_FF(fs, FR_DISK_ERR);
                }
                fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            /* Update the directory entry */
            tm = GET_FATTIME();             /* Modified time */
#if FF_FS_EXFAT
            if(fs->fs_type == FS_EXFAT) {
                res = fill_first_frag(&fp->obj);    /* Fill first fragment on the FAT if needed */
                if(res == FR_OK) {
                    res = fill_last_frag(&fp->obj, fp->clust, 0xFFFFFFFF);  /* Fill last fragment on the FAT if needed */
                }
                if(res == FR_OK) {
                    DIR dj;
                    DEF_NAMBUF

                    INIT_NAMBUF(fs);
                    res = load_obj_xdir(&dj, &fp->obj); /* Load directory entry block */
                    if(res == FR_OK) {
                        fs->dirbuf[XDIR_Attr] |= AM_ARC;                /* Set archive attribute to indicate that the file has been changed */
                        fs->dirbuf[XDIR_GenFlags] = fp->obj.stat | 1;   /* Update file allocation information */
                        st_dword(fs->dirbuf + XDIR_FstClus, fp->obj.sclust);
                        st_qword(fs->dirbuf + XDIR_FileSize, fp->obj.objsize);
                        st_qword(fs->dirbuf + XDIR_ValidFileSize, fp->obj.objsize);
                        st_dword(fs->dirbuf + XDIR_ModTime, tm);        /* Update modified time */
                        fs->dirbuf[XDIR_ModTime10] = 0;
                        st_dword(fs->dirbuf + XDIR_AccTime, 0);
                        res = store_xdir(&dj);  /* Restore it to the directory */
                        if(res == FR_OK) {
                            res = sync_fs(fs);
                            fp->flag &= (BYTE)~FA_MODIFIED;
                        }
                    }
                    FREE_NAMBUF();
                }
            } else
#endif
            {
                res = move_window(fs, fp->dir_sect);
                if(res == FR_OK) {
                    dir = fp->dir_ptr;
                    dir[DIR_Attr] |= AM_ARC;                        /* Set archive attribute to indicate that the file has been changed */
                    st_clust(fp->obj.fs, dir, fp->obj.sclust);      /* Update file allocation information  */
                    st_dword(dir + DIR_FileSize, (DWORD)fp->obj.objsize);   /* Update file size */
                    st_dword(dir + DIR_ModTime, tm);                /* Update modified time */
                    st_word(dir + DIR_LstAccDate, 0);
                    fs->wflag = 1;
                    res = sync_fs(fs);                  /* Restore it to the directory */
                    fp->flag &= (BYTE)~FA_MODIFIED;
                }
            }
        }
    }

    LEAVE_FF(fs, res);
}

#endif /* !FF_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Close File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_close(
    FIL *fp     /* Pointer to the file object to be closed */
)
{
    FRESULT res;
    FATFS *fs;

#if !FF_FS_READONLY
    res = f_sync(fp);                   /* Flush cached data */
    if(res == FR_OK)
#endif
    {
        res = validate(&fp->obj, &fs);  /* Lock volume */
        if(res == FR_OK) {
#if FF_FS_LOCK != 0
            res = dec_lock(fp->obj.lockid);     /* Decrement file open counter */
            if(res == FR_OK) {
                fp->obj.fs = 0;    /* Invalidate file object */
            }
#else
            fp->obj.fs = 0; /* Invalidate file object */
#endif
#if FF_FS_REENTRANT
            unlock_fs(fs, FR_OK);       /* Unlock volume */
#endif
        }
    }
    return res;
}




#if FF_FS_RPATH >= 1
/*-----------------------------------------------------------------------*/
/* Change Current Directory or Current Drive, Get Current Directory      */
/*-----------------------------------------------------------------------*/

FRESULT f_chdrive(
    const TCHAR *path       /* Drive number to set */
)
{
    int vol;


    /* Get logical drive number */
    vol = get_ldnumber(&path);
    if(vol < 0) {
        return FR_INVALID_DRIVE;
    }
    CurrVol = (BYTE)vol;    /* Set it as current volume */

    return FR_OK;
}



FRESULT f_chdir(
    const TCHAR *path   /* Pointer to the directory path */
)
{
#if FF_STR_VOLUME_ID == 2
    UINT i;
#endif
    FRESULT res;
    DIR dj;
    FATFS *fs;
    DEF_NAMBUF


    /* Get logical drive */
    res = find_volume(&path, &fs, 0);
    if(res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);       /* Follow the path */
        if(res == FR_OK) {                  /* Follow completed */
            if(dj.fn[NSFLAG] & NS_NONAME) {     /* Is it the start directory itself? */
                fs->cdir = dj.obj.sclust;
#if FF_FS_EXFAT
                if(fs->fs_type == FS_EXFAT) {
                    fs->cdc_scl = dj.obj.c_scl;
                    fs->cdc_size = dj.obj.c_size;
                    fs->cdc_ofs = dj.obj.c_ofs;
                }
#endif
            } else {
                if(dj.obj.attr & AM_DIR) {  /* It is a sub-directory */
#if FF_FS_EXFAT
                    if(fs->fs_type == FS_EXFAT) {
                        fs->cdir = ld_dword(fs->dirbuf + XDIR_FstClus);     /* Sub-directory cluster */
                        fs->cdc_scl = dj.obj.sclust;                        /* Save containing directory information */
                        fs->cdc_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
                        fs->cdc_ofs = dj.blk_ofs;
                    } else
#endif
                    {
                        fs->cdir = ld_clust(fs, dj.dir);                    /* Sub-directory cluster */
                    }
                } else {
                    res = FR_NO_PATH;       /* Reached but a file */
                }
            }
        }
        FREE_NAMBUF();
        if(res == FR_NO_FILE) {
            res = FR_NO_PATH;
        }
#if FF_STR_VOLUME_ID == 2   /* Also current drive is changed at Unix style volume ID */
        if(res == FR_OK) {
            for(i = FF_VOLUMES - 1; i && fs != FatFs[i]; i--) ;     /* Set current drive */
            CurrVol = (BYTE)i;
        }
#endif
    }

    LEAVE_FF(fs, res);
}


#if FF_FS_RPATH >= 2
FRESULT f_getcwd(
    TCHAR *buff,    /* Pointer to the directory path */
    UINT len        /* Size of buff in unit of TCHAR */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    UINT i, n;
    DWORD ccl;
    TCHAR *tp = buff;
#if FF_VOLUMES >= 2
    UINT vl;
#endif
#if FF_STR_VOLUME_ID
    const char *vp;
#endif
    FILINFO fno;
    DEF_NAMBUF


    /* Get logical drive */
    buff[0] = 0;    /* Set null string to get current volume */
    res = find_volume((const TCHAR **)&buff, &fs, 0);   /* Get current volume */
    if(res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);

        /* Follow parent directories and create the path */
        i = len;            /* Bottom of buffer (directory stack base) */
        if(!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {   /* (Cannot do getcwd on exFAT and returns root path) */
            dj.obj.sclust = fs->cdir;               /* Start to follow upper directory from current directory */
            while((ccl = dj.obj.sclust) != 0) {     /* Repeat while current directory is a sub-directory */
                res = dir_sdi(&dj, 1 * SZDIRE); /* Get parent directory */
                if(res != FR_OK) {
                    break;
                }
                res = move_window(fs, dj.sect);
                if(res != FR_OK) {
                    break;
                }
                dj.obj.sclust = ld_clust(fs, dj.dir);   /* Goto parent directory */
                res = dir_sdi(&dj, 0);
                if(res != FR_OK) {
                    break;
                }
                do {                            /* Find the entry links to the child directory */
                    res = DIR_READ_FILE(&dj);
                    if(res != FR_OK) {
                        break;
                    }
                    if(ccl == ld_clust(fs, dj.dir)) {
                        break;    /* Found the entry */
                    }
                    res = dir_next(&dj, 0);
                } while(res == FR_OK);
                if(res == FR_NO_FILE) {
                    res = FR_INT_ERR;    /* It cannot be 'not found'. */
                }
                if(res != FR_OK) {
                    break;
                }
                get_fileinfo(&dj, &fno);        /* Get the directory name and push it to the buffer */
                for(n = 0; fno.fname[n]; n++) ;     /* Name length */
                if(i < n + 1) {     /* Insufficient space to store the path name? */
                    res = FR_NOT_ENOUGH_CORE;
                    break;
                }
                while(n) {
                    buff[--i] = fno.fname[--n];    /* Stack the name */
                }
                buff[--i] = '/';
            }
        }
        if(res == FR_OK) {
            if(i == len) {
                buff[--i] = '/';    /* Is it the root-directory? */
            }
#if FF_VOLUMES >= 2         /* Put drive prefix */
            vl = 0;
#if FF_STR_VOLUME_ID >= 1   /* String volume ID */
            for(n = 0, vp = (const char *)VolumeStr[CurrVol]; vp[n]; n++) ;
            if(i >= n + 2) {
                if(FF_STR_VOLUME_ID == 2) {
                    *tp++ = (TCHAR)'/';
                }
                for(vl = 0; vl < n; *tp++ = (TCHAR)vp[vl], vl++) ;
                if(FF_STR_VOLUME_ID == 1) {
                    *tp++ = (TCHAR)':';
                }
                vl++;
            }
#else                       /* Numeric volume ID */
            if(i >= 3) {
                *tp++ = (TCHAR)'0' + CurrVol;
                *tp++ = (TCHAR)':';
                vl = 2;
            }
#endif
            if(vl == 0) {
                res = FR_NOT_ENOUGH_CORE;
            }
#endif
            /* Add current directory path */
            if(res == FR_OK) {
                do {
                    *tp++ = buff[i++];
                } while(i < len);   /* Copy stacked path string */
            }
        }
        FREE_NAMBUF();
    }

    *tp = 0;
    LEAVE_FF(fs, res);
}

#endif /* FF_FS_RPATH >= 2 */
#endif /* FF_FS_RPATH >= 1 */



#if FF_FS_MINIMIZE <= 2
/*-----------------------------------------------------------------------*/
/* Seek File Read/Write Pointer                                          */
/*-----------------------------------------------------------------------*/

FRESULT f_lseek(
    FIL *fp,        /* Pointer to the file object */
    FSIZE_t ofs     /* File pointer from top of file */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD clst, bcs, nsect;
    FSIZE_t ifptr;
#if FF_USE_FASTSEEK
    DWORD cl, pcl, ncl, tcl, dsc, tlen, ulen, *tbl;
#endif

    res = validate(&fp->obj, &fs);      /* Check validity of the file object */
    if(res == FR_OK) {
        res = (FRESULT)fp->err;
    }
#if FF_FS_EXFAT && !FF_FS_READONLY
    if(res == FR_OK && fs->fs_type == FS_EXFAT) {
        res = fill_last_frag(&fp->obj, fp->clust, 0xFFFFFFFF);  /* Fill last fragment on the FAT if needed */
    }
#endif
    if(res != FR_OK) {
        LEAVE_FF(fs, res);
    }

#if FF_USE_FASTSEEK
    if(fp->cltbl) {     /* Fast seek */
        if(ofs == CREATE_LINKMAP) {     /* Create CLMT */
            tbl = fp->cltbl;
            tlen = *tbl++;
            ulen = 2;    /* Given table size and required table size */
            cl = fp->obj.sclust;        /* Origin of the chain */
            if(cl != 0) {
                do {
                    /* Get a fragment */
                    tcl = cl;
                    ncl = 0;
                    ulen += 2;   /* Top, length and used items */
                    do {
                        pcl = cl;
                        ncl++;
                        cl = get_fat(&fp->obj, cl);
                        if(cl <= 1) {
                            ABORT(fs, FR_INT_ERR);
                        }
                        if(cl == 0xFFFFFFFF) {
                            ABORT(fs, FR_DISK_ERR);
                        }
                    } while(cl == pcl + 1);
                    if(ulen <= tlen) {      /* Store the length and top of the fragment */
                        *tbl++ = ncl;
                        *tbl++ = tcl;
                    }
                } while(cl < fs->n_fatent);     /* Repeat until end of chain */
            }
            *fp->cltbl = ulen;  /* Number of items used */
            if(ulen <= tlen) {
                *tbl = 0;       /* Terminate table */
            } else {
                res = FR_NOT_ENOUGH_CORE;   /* Given table size is smaller than required */
            }
        } else {                        /* Fast seek */
            if(ofs > fp->obj.objsize) {
                ofs = fp->obj.objsize;    /* Clip offset at the file size */
            }
            fp->fptr = ofs;             /* Set file pointer */
            if(ofs > 0) {
                fp->clust = clmt_clust(fp, ofs - 1);
                dsc = clst2sect(fs, fp->clust);
                if(dsc == 0) {
                    ABORT(fs, FR_INT_ERR);
                }
                dsc += (DWORD)((ofs - 1) / SS(fs)) & (fs->csize - 1);
                if(fp->fptr % SS(fs) && dsc != fp->sect) {  /* Refill sector cache if needed */
#if !FF_FS_TINY
#if !FF_FS_READONLY
                    if(fp->flag & FA_DIRTY) {       /* Write-back dirty sector cache */
                        if(disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
                            ABORT(fs, FR_DISK_ERR);
                        }
                        fp->flag &= (BYTE)~FA_DIRTY;
                    }
#endif
                    if(disk_read(fs->pdrv, fp->buf, dsc, 1) != RES_OK) {
                        ABORT(fs, FR_DISK_ERR);    /* Load current sector */
                    }
#endif
                    fp->sect = dsc;
                }
            }
        }
    } else
#endif

        /* Normal Seek */
    {
#if FF_FS_EXFAT
        if(fs->fs_type != FS_EXFAT && ofs >= 0x100000000) {
            ofs = 0xFFFFFFFF;    /* Clip at 4 GiB - 1 if at FATxx */
        }
#endif
        if(ofs > fp->obj.objsize && (FF_FS_READONLY || !(fp->flag & FA_WRITE))) {   /* In read-only mode, clip offset with the file size */
            ofs = fp->obj.objsize;
        }
        ifptr = fp->fptr;
        fp->fptr = nsect = 0;
        if(ofs > 0) {
            bcs = (DWORD)fs->csize * SS(fs);    /* Cluster size (byte) */
            if(ifptr > 0 &&
                    (ofs - 1) / bcs >= (ifptr - 1) / bcs) { /* When seek to same or following cluster, */
                fp->fptr = (ifptr - 1) & ~(FSIZE_t)(bcs - 1);   /* start from the current cluster */
                ofs -= fp->fptr;
                clst = fp->clust;
            } else {                                    /* When seek to back cluster, */
                clst = fp->obj.sclust;                  /* start from the first cluster */
#if !FF_FS_READONLY
                if(clst == 0) {                         /* If no cluster chain, create a new chain */
                    clst = create_chain(&fp->obj, 0);
                    if(clst == 1) {
                        ABORT(fs, FR_INT_ERR);
                    }
                    if(clst == 0xFFFFFFFF) {
                        ABORT(fs, FR_DISK_ERR);
                    }
                    fp->obj.sclust = clst;
                }
#endif
                fp->clust = clst;
            }
            if(clst != 0) {
                while(ofs > bcs) {                      /* Cluster following loop */
                    ofs -= bcs;
                    fp->fptr += bcs;
#if !FF_FS_READONLY
                    if(fp->flag & FA_WRITE) {           /* Check if in write mode or not */
                        if(FF_FS_EXFAT && fp->fptr > fp->obj.objsize) {     /* No FAT chain object needs correct objsize to generate FAT value */
                            fp->obj.objsize = fp->fptr;
                            fp->flag |= FA_MODIFIED;
                        }
                        clst = create_chain(&fp->obj, clst);    /* Follow chain with forceed stretch */
                        if(clst == 0) {                 /* Clip file size in case of disk full */
                            ofs = 0;
                            break;
                        }
                    } else
#endif
                    {
                        clst = get_fat(&fp->obj, clst); /* Follow cluster chain if not in write mode */
                    }
                    if(clst == 0xFFFFFFFF) {
                        ABORT(fs, FR_DISK_ERR);
                    }
                    if(clst <= 1 || clst >= fs->n_fatent) {
                        ABORT(fs, FR_INT_ERR);
                    }
                    fp->clust = clst;
                }
                fp->fptr += ofs;
                if(ofs % SS(fs)) {
                    nsect = clst2sect(fs, clst);    /* Current sector */
                    if(nsect == 0) {
                        ABORT(fs, FR_INT_ERR);
                    }
                    nsect += (DWORD)(ofs / SS(fs));
                }
            }
        }
        if(!FF_FS_READONLY && fp->fptr > fp->obj.objsize) {     /* Set file change flag if the file size is extended */
            fp->obj.objsize = fp->fptr;
            fp->flag |= FA_MODIFIED;
        }
        if(fp->fptr % SS(fs) && nsect != fp->sect) {    /* Fill sector cache if needed */
#if !FF_FS_TINY
#if !FF_FS_READONLY
            if(fp->flag & FA_DIRTY) {           /* Write-back dirty sector cache */
                if(disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
                    ABORT(fs, FR_DISK_ERR);
                }
                fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            if(disk_read(fs->pdrv, fp->buf, nsect, 1) != RES_OK) {
                ABORT(fs, FR_DISK_ERR);    /* Fill sector cache */
            }
#endif
            fp->sect = nsect;
        }
    }

    LEAVE_FF(fs, res);
}



#if FF_FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Create a Directory Object                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_opendir(
    DIR *dp,            /* Pointer to directory object to create */
    const TCHAR *path   /* Pointer to the directory path */
)
{
    FRESULT res;
    FATFS *fs;
    DEF_NAMBUF


    if(!dp) {
        return FR_INVALID_OBJECT;
    }

    /* Get logical drive */
    res = find_volume(&path, &fs, 0);
    if(res == FR_OK) {
        dp->obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(dp, path);            /* Follow the path to the directory */
        if(res == FR_OK) {                      /* Follow completed */
            if(!(dp->fn[NSFLAG] & NS_NONAME)) {     /* It is not the origin directory itself */
                if(dp->obj.attr & AM_DIR) {         /* This object is a sub-directory */
#if FF_FS_EXFAT
                    if(fs->fs_type == FS_EXFAT) {
                        dp->obj.c_scl = dp->obj.sclust;                         /* Get containing directory inforamation */
                        dp->obj.c_size = ((DWORD)dp->obj.objsize & 0xFFFFFF00) | dp->obj.stat;
                        dp->obj.c_ofs = dp->blk_ofs;
                        init_alloc_info(fs, &dp->obj);  /* Get object allocation info */
                    } else
#endif
                    {
                        dp->obj.sclust = ld_clust(fs, dp->dir); /* Get object allocation info */
                    }
                } else {                        /* This object is a file */
                    res = FR_NO_PATH;
                }
            }
            if(res == FR_OK) {
                dp->obj.id = fs->id;
                res = dir_sdi(dp, 0);           /* Rewind directory */
#if FF_FS_LOCK != 0
                if(res == FR_OK) {
                    if(dp->obj.sclust != 0) {
                        dp->obj.lockid = inc_lock(dp, 0);   /* Lock the sub directory */
                        if(!dp->obj.lockid) {
                            res = FR_TOO_MANY_OPEN_FILES;
                        }
                    } else {
                        dp->obj.lockid = 0; /* Root directory need not to be locked */
                    }
                }
#endif
            }
        }
        FREE_NAMBUF();
        if(res == FR_NO_FILE) {
            res = FR_NO_PATH;
        }
    }
    if(res != FR_OK) {
        dp->obj.fs = 0;    /* Invalidate the directory object if function faild */
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Close Directory                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_closedir(
    DIR *dp     /* Pointer to the directory object to be closed */
)
{
    FRESULT res;
    FATFS *fs;


    res = validate(&dp->obj, &fs);  /* Check validity of the file object */
    if(res == FR_OK) {
#if FF_FS_LOCK != 0
        if(dp->obj.lockid) {
            res = dec_lock(dp->obj.lockid);    /* Decrement sub-directory open counter */
        }
        if(res == FR_OK) {
            dp->obj.fs = 0;    /* Invalidate directory object */
        }
#else
        dp->obj.fs = 0; /* Invalidate directory object */
#endif
#if FF_FS_REENTRANT
        unlock_fs(fs, FR_OK);       /* Unlock volume */
#endif
    }
    return res;
}




/*-----------------------------------------------------------------------*/
/* Read Directory Entries in Sequence                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_readdir(
    DIR *dp,            /* Pointer to the open directory object */
    FILINFO *fno        /* Pointer to file information to return */
)
{
    FRESULT res;
    FATFS *fs;
    DEF_NAMBUF


    res = validate(&dp->obj, &fs);  /* Check validity of the directory object */
    if(res == FR_OK) {
        if(!fno) {
            res = dir_sdi(dp, 0);           /* Rewind the directory object */
        } else {
            INIT_NAMBUF(fs);
            res = DIR_READ_FILE(dp);        /* Read an item */
            if(res == FR_NO_FILE) {
                res = FR_OK;    /* Ignore end of directory */
            }
            if(res == FR_OK) {              /* A valid entry is found */
                get_fileinfo(dp, fno);      /* Get the object information */
                res = dir_next(dp, 0);      /* Increment index for next */
                if(res == FR_NO_FILE) {
                    res = FR_OK;    /* Ignore end of directory now */
                }
            }
            FREE_NAMBUF();
        }
    }
    LEAVE_FF(fs, res);
}



#if FF_USE_FIND
/*-----------------------------------------------------------------------*/
/* Find Next File                                                        */
/*-----------------------------------------------------------------------*/

FRESULT f_findnext(
    DIR *dp,        /* Pointer to the open directory object */
    FILINFO *fno    /* Pointer to the file information structure */
)
{
    FRESULT res;


    for(;;) {
        res = f_readdir(dp, fno);       /* Get a directory item */
        if(res != FR_OK || !fno || !fno->fname[0]) {
            break;    /* Terminate if any error or end of directory */
        }
        if(pattern_matching(dp->pat, fno->fname, 0, 0)) {
            break;    /* Test for the file name */
        }
#if FF_USE_LFN && FF_USE_FIND == 2
        if(pattern_matching(dp->pat, fno->altname, 0, 0)) {
            break;    /* Test for alternative name if exist */
        }
#endif
    }
    return res;
}



/*-----------------------------------------------------------------------*/
/* Find First File                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_findfirst(
    DIR *dp,                /* Pointer to the blank directory object */
    FILINFO *fno,           /* Pointer to the file information structure */
    const TCHAR *path,      /* Pointer to the directory to open */
    const TCHAR *pattern    /* Pointer to the matching pattern */
)
{
    FRESULT res;


    dp->pat = pattern;      /* Save pointer to pattern string */
    res = f_opendir(dp, path);      /* Open the target directory */
    if(res == FR_OK) {
        res = f_findnext(dp, fno);  /* Find the first item */
    }
    return res;
}

#endif  /* FF_USE_FIND */



#if FF_FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Get File Status                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_stat(
    const TCHAR *path,  /* Pointer to the file path */
    FILINFO *fno        /* Pointer to file information to return */
)
{
    FRESULT res;
    DIR dj;
    DEF_NAMBUF


    /* Get logical drive */
    res = find_volume(&path, &dj.obj.fs, 0);
    if(res == FR_OK) {
        INIT_NAMBUF(dj.obj.fs);
        res = follow_path(&dj, path);   /* Follow the file path */
        if(res == FR_OK) {              /* Follow completed */
            if(dj.fn[NSFLAG] & NS_NONAME) {     /* It is origin directory */
                res = FR_INVALID_NAME;
            } else {                            /* Found an object */
                if(fno) {
                    get_fileinfo(&dj, fno);
                }
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(dj.obj.fs, res);
}



#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Get Number of Free Clusters                                           */
/*-----------------------------------------------------------------------*/

FRESULT f_getfree(
    const TCHAR *path,  /* Logical drive number */
    DWORD *nclst,       /* Pointer to a variable to return number of free clusters */
    FATFS **fatfs       /* Pointer to return pointer to corresponding filesystem object */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD nfree, clst, sect, stat;
    UINT i;
    FFOBJID obj;


    /* Get logical drive */
    res = find_volume(&path, &fs, 0);
    if(res == FR_OK) {
        *fatfs = fs;                /* Return ptr to the fs object */
        /* If free_clst is valid, return it without full FAT scan */
        if(fs->free_clst <= fs->n_fatent - 2) {
            *nclst = fs->free_clst;
        } else {
            /* Scan FAT to obtain number of free clusters */
            nfree = 0;
            if(fs->fs_type == FS_FAT12) {   /* FAT12: Scan bit field FAT entries */
                clst = 2;
                obj.fs = fs;
                do {
                    stat = get_fat(&obj, clst);
                    if(stat == 0xFFFFFFFF) {
                        res = FR_DISK_ERR;
                        break;
                    }
                    if(stat == 1) {
                        res = FR_INT_ERR;
                        break;
                    }
                    if(stat == 0) {
                        nfree++;
                    }
                } while(++clst < fs->n_fatent);
            } else {
#if FF_FS_EXFAT
                if(fs->fs_type == FS_EXFAT) {   /* exFAT: Scan allocation bitmap */
                    BYTE bm;
                    UINT b;

                    clst = fs->n_fatent - 2;    /* Number of clusters */
                    sect = fs->bitbase;         /* Bitmap sector */
                    i = 0;                      /* Offset in the sector */
                    do {    /* Counts numbuer of bits with zero in the bitmap */
                        if(i == 0) {
                            res = move_window(fs, sect++);
                            if(res != FR_OK) {
                                break;
                            }
                        }
                        for(b = 8, bm = fs->win[i]; b && clst; b--, clst--) {
                            if(!(bm & 1)) {
                                nfree++;
                            }
                            bm >>= 1;
                        }
                        i = (i + 1) % SS(fs);
                    } while(clst);
                } else
#endif
                { /* FAT16/32: Scan WORD/DWORD FAT entries */
                    clst = fs->n_fatent;    /* Number of entries */
                    sect = fs->fatbase;     /* Top of the FAT */
                    i = 0;                  /* Offset in the sector */
                    do {    /* Counts numbuer of entries with zero in the FAT */
                        if(i == 0) {
                            res = move_window(fs, sect++);
                            if(res != FR_OK) {
                                break;
                            }
                        }
                        if(fs->fs_type == FS_FAT16) {
                            if(ld_word(fs->win + i) == 0) {
                                nfree++;
                            }
                            i += 2;
                        } else {
                            if((ld_dword(fs->win + i) & 0x0FFFFFFF) == 0) {
                                nfree++;
                            }
                            i += 4;
                        }
                        i %= SS(fs);
                    } while(--clst);
                }
            }
            *nclst = nfree;         /* Return the free clusters */
            fs->free_clst = nfree;  /* Now free_clst is valid */
            fs->fsi_flag |= 1;      /* FAT32: FSInfo is to be updated */
        }
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Truncate File                                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_truncate(
    FIL *fp     /* Pointer to the file object */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD ncl;


    res = validate(&fp->obj, &fs);  /* Check validity of the file object */
    if(res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) {
        LEAVE_FF(fs, res);
    }
    if(!(fp->flag & FA_WRITE)) {
        LEAVE_FF(fs, FR_DENIED);    /* Check access mode */
    }

    if(fp->fptr < fp->obj.objsize) {    /* Process when fptr is not on the eof */
        if(fp->fptr == 0) {     /* When set file size to zero, remove entire cluster chain */
            res = remove_chain(&fp->obj, fp->obj.sclust, 0);
            fp->obj.sclust = 0;
        } else {                /* When truncate a part of the file, remove remaining clusters */
            ncl = get_fat(&fp->obj, fp->clust);
            res = FR_OK;
            if(ncl == 0xFFFFFFFF) {
                res = FR_DISK_ERR;
            }
            if(ncl == 1) {
                res = FR_INT_ERR;
            }
            if(res == FR_OK && ncl < fs->n_fatent) {
                res = remove_chain(&fp->obj, ncl, fp->clust);
            }
        }
        fp->obj.objsize = fp->fptr; /* Set file size to current read/write point */
        fp->flag |= FA_MODIFIED;
#if !FF_FS_TINY
        if(res == FR_OK && (fp->flag & FA_DIRTY)) {
            if(disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
                res = FR_DISK_ERR;
            } else {
                fp->flag &= (BYTE)~FA_DIRTY;
            }
        }
#endif
        if(res != FR_OK) {
            ABORT(fs, res);
        }
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Delete a File/Directory                                               */
/*-----------------------------------------------------------------------*/

FRESULT f_unlink(
    const TCHAR *path       /* Pointer to the file or directory path */
)
{
    FRESULT res;
    DIR dj, sdj;
    DWORD dclst = 0;
    FATFS *fs;
#if FF_FS_EXFAT
    FFOBJID obj;
#endif
    DEF_NAMBUF


    /* Get logical drive */
    res = find_volume(&path, &fs, FA_WRITE);
    if(res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);       /* Follow the file path */
        if(FF_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT)) {
            res = FR_INVALID_NAME;          /* Cannot remove dot entry */
        }
#if FF_FS_LOCK != 0
        if(res == FR_OK) {
            res = chk_lock(&dj, 2);    /* Check if it is an open object */
        }
#endif
        if(res == FR_OK) {                  /* The object is accessible */
            if(dj.fn[NSFLAG] & NS_NONAME) {
                res = FR_INVALID_NAME;      /* Cannot remove the origin directory */
            } else {
                if(dj.obj.attr & AM_RDO) {
                    res = FR_DENIED;        /* Cannot remove R/O object */
                }
            }
            if(res == FR_OK) {
#if FF_FS_EXFAT
                obj.fs = fs;
                if(fs->fs_type == FS_EXFAT) {
                    init_alloc_info(fs, &obj);
                    dclst = obj.sclust;
                } else
#endif
                {
                    dclst = ld_clust(fs, dj.dir);
                }
                if(dj.obj.attr & AM_DIR) {          /* Is it a sub-directory? */
#if FF_FS_RPATH != 0
                    if(dclst == fs->cdir) {             /* Is it the current directory? */
                        res = FR_DENIED;
                    } else
#endif
                    {
                        sdj.obj.fs = fs;                /* Open the sub-directory */
                        sdj.obj.sclust = dclst;
#if FF_FS_EXFAT
                        if(fs->fs_type == FS_EXFAT) {
                            sdj.obj.objsize = obj.objsize;
                            sdj.obj.stat = obj.stat;
                        }
#endif
                        res = dir_sdi(&sdj, 0);
                        if(res == FR_OK) {
                            res = DIR_READ_FILE(&sdj);          /* Test if the directory is empty */
                            if(res == FR_OK) {
                                res = FR_DENIED;    /* Not empty? */
                            }
                            if(res == FR_NO_FILE) {
                                res = FR_OK;    /* Empty? */
                            }
                        }
                    }
                }
            }
            if(res == FR_OK) {
                res = dir_remove(&dj);          /* Remove the directory entry */
                if(res == FR_OK && dclst != 0) {    /* Remove the cluster chain if exist */
#if FF_FS_EXFAT
                    res = remove_chain(&obj, dclst, 0);
#else
                    res = remove_chain(&dj.obj, dclst, 0);
#endif
                }
                if(res == FR_OK) {
                    res = sync_fs(fs);
                }
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Create a Directory                                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_mkdir(
    const TCHAR *path       /* Pointer to the directory path */
)
{
    FRESULT res;
    DIR dj;
    FFOBJID sobj;
    FATFS *fs;
    DWORD dcl, pcl, tm;
    DEF_NAMBUF


    res = find_volume(&path, &fs, FA_WRITE);    /* Get logical drive */
    if(res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);           /* Follow the file path */
        if(res == FR_OK) {
            res = FR_EXIST;    /* Name collision? */
        }
        if(FF_FS_RPATH && res == FR_NO_FILE && (dj.fn[NSFLAG] & NS_DOT)) {  /* Invalid name? */
            res = FR_INVALID_NAME;
        }
        if(res == FR_NO_FILE) {                 /* It is clear to create a new directory */
            sobj.fs = fs;                       /* New object id to create a new chain */
            dcl = create_chain(&sobj, 0);       /* Allocate a cluster for the new directory */
            res = FR_OK;
            if(dcl == 0) {
                res = FR_DENIED;    /* No space to allocate a new cluster? */
            }
            if(dcl == 1) {
                res = FR_INT_ERR;    /* Any insanity? */
            }
            if(dcl == 0xFFFFFFFF) {
                res = FR_DISK_ERR;    /* Disk error? */
            }
            tm = GET_FATTIME();
            if(res == FR_OK) {
                res = dir_clear(fs, dcl);       /* Clean up the new table */
                if(res == FR_OK) {
                    if(!FF_FS_EXFAT || fs->fs_type != FS_EXFAT) {   /* Create dot entries (FAT only) */
                        mem_set(fs->win + DIR_Name, ' ', 11);   /* Create "." entry */
                        fs->win[DIR_Name] = '.';
                        fs->win[DIR_Attr] = AM_DIR;
                        st_dword(fs->win + DIR_ModTime, tm);
                        st_clust(fs, fs->win, dcl);
                        mem_cpy(fs->win + SZDIRE, fs->win, SZDIRE); /* Create ".." entry */
                        fs->win[SZDIRE + 1] = '.';
                        pcl = dj.obj.sclust;
                        st_clust(fs, fs->win + SZDIRE, pcl);
                        fs->wflag = 1;
                    }
                    res = dir_register(&dj);    /* Register the object to the parent directoy */
                }
            }
            if(res == FR_OK) {
#if FF_FS_EXFAT
                if(fs->fs_type == FS_EXFAT) {   /* Initialize directory entry block */
                    st_dword(fs->dirbuf + XDIR_ModTime, tm);    /* Created time */
                    st_dword(fs->dirbuf + XDIR_FstClus, dcl);   /* Table start cluster */
                    st_dword(fs->dirbuf + XDIR_FileSize, (DWORD)fs->csize * SS(fs));    /* File size needs to be valid */
                    st_dword(fs->dirbuf + XDIR_ValidFileSize, (DWORD)fs->csize * SS(fs));
                    fs->dirbuf[XDIR_GenFlags] = 3;              /* Initialize the object flag */
                    fs->dirbuf[XDIR_Attr] = AM_DIR;             /* Attribute */
                    res = store_xdir(&dj);
                } else
#endif
                {
                    st_dword(dj.dir + DIR_ModTime, tm); /* Created time */
                    st_clust(fs, dj.dir, dcl);          /* Table start cluster */
                    dj.dir[DIR_Attr] = AM_DIR;          /* Attribute */
                    fs->wflag = 1;
                }
                if(res == FR_OK) {
                    res = sync_fs(fs);
                }
            } else {
                remove_chain(&sobj, dcl, 0);        /* Could not register, remove the allocated cluster */
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Rename a File/Directory                                               */
/*-----------------------------------------------------------------------*/

FRESULT f_rename(
    const TCHAR *path_old,  /* Pointer to the object name to be renamed */
    const TCHAR *path_new   /* Pointer to the new name */
)
{
    FRESULT res;
    DIR djo, djn;
    FATFS *fs;
    BYTE buf[FF_FS_EXFAT ? SZDIRE * 2 : SZDIRE], *dir;
    DWORD dw;
    DEF_NAMBUF


    get_ldnumber(&path_new);                        /* Snip the drive number of new name off */
    res = find_volume(&path_old, &fs, FA_WRITE);    /* Get logical drive of the old object */
    if(res == FR_OK) {
        djo.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&djo, path_old);      /* Check old object */
        if(res == FR_OK && (djo.fn[NSFLAG] & (NS_DOT | NS_NONAME))) {
            res = FR_INVALID_NAME;    /* Check validity of name */
        }
#if FF_FS_LOCK != 0
        if(res == FR_OK) {
            res = chk_lock(&djo, 2);
        }
#endif
        if(res == FR_OK) {                      /* Object to be renamed is found */
#if FF_FS_EXFAT
            if(fs->fs_type == FS_EXFAT) {   /* At exFAT volume */
                BYTE nf, nn;
                WORD nh;

                mem_cpy(buf, fs->dirbuf, SZDIRE * 2);   /* Save 85+C0 entry of old object */
                mem_cpy(&djn, &djo, sizeof djo);
                res = follow_path(&djn, path_new);      /* Make sure if new object name is not in use */
                if(res == FR_OK) {                      /* Is new name already in use by any other object? */
                    res = (djn.obj.sclust == djo.obj.sclust && djn.dptr == djo.dptr) ? FR_NO_FILE : FR_EXIST;
                }
                if(res == FR_NO_FILE) {                 /* It is a valid path and no name collision */
                    res = dir_register(&djn);           /* Register the new entry */
                    if(res == FR_OK) {
                        nf = fs->dirbuf[XDIR_NumSec];
                        nn = fs->dirbuf[XDIR_NumName];
                        nh = ld_word(fs->dirbuf + XDIR_NameHash);
                        mem_cpy(fs->dirbuf, buf, SZDIRE * 2);   /* Restore 85+C0 entry */
                        fs->dirbuf[XDIR_NumSec] = nf;
                        fs->dirbuf[XDIR_NumName] = nn;
                        st_word(fs->dirbuf + XDIR_NameHash, nh);
                        if(!(fs->dirbuf[XDIR_Attr] & AM_DIR)) {
                            fs->dirbuf[XDIR_Attr] |= AM_ARC;    /* Set archive attribute if it is a file */
                        }
                        /* Start of critical section where an interruption can cause a cross-link */
                        res = store_xdir(&djn);
                    }
                }
            } else
#endif
            { /* At FAT/FAT32 volume */
                mem_cpy(buf, djo.dir, SZDIRE);          /* Save directory entry of the object */
                mem_cpy(&djn, &djo, sizeof(DIR));       /* Duplicate the directory object */
                res = follow_path(&djn, path_new);      /* Make sure if new object name is not in use */
                if(res == FR_OK) {                      /* Is new name already in use by any other object? */
                    res = (djn.obj.sclust == djo.obj.sclust && djn.dptr == djo.dptr) ? FR_NO_FILE : FR_EXIST;
                }
                if(res == FR_NO_FILE) {                 /* It is a valid path and no name collision */
                    res = dir_register(&djn);           /* Register the new entry */
                    if(res == FR_OK) {
                        dir = djn.dir;                  /* Copy directory entry of the object except name */
                        mem_cpy(dir + 13, buf + 13, SZDIRE - 13);
                        dir[DIR_Attr] = buf[DIR_Attr];
                        if(!(dir[DIR_Attr] & AM_DIR)) {
                            dir[DIR_Attr] |= AM_ARC;    /* Set archive attribute if it is a file */
                        }
                        fs->wflag = 1;
                        if((dir[DIR_Attr] & AM_DIR) && djo.obj.sclust != djn.obj.sclust) {  /* Update .. entry in the sub-directory if needed */
                            dw = clst2sect(fs, ld_clust(fs, dir));
                            if(dw == 0) {
                                res = FR_INT_ERR;
                            } else {
                                /* Start of critical section where an interruption can cause a cross-link */
                                res = move_window(fs, dw);
                                dir = fs->win + SZDIRE * 1; /* Ptr to .. entry */
                                if(res == FR_OK && dir[1] == '.') {
                                    st_clust(fs, dir, djn.obj.sclust);
                                    fs->wflag = 1;
                                }
                            }
                        }
                    }
                }
            }
            if(res == FR_OK) {
                res = dir_remove(&djo);     /* Remove old entry */
                if(res == FR_OK) {
                    res = sync_fs(fs);
                }
            }
            /* End of the critical section */
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}

#endif /* !FF_FS_READONLY */
#endif /* FF_FS_MINIMIZE == 0 */
#endif /* FF_FS_MINIMIZE <= 1 */
#endif /* FF_FS_MINIMIZE <= 2 */



#if FF_USE_CHMOD && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Change Attribute                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_chmod(
    const TCHAR *path,  /* Pointer to the file path */
    BYTE attr,          /* Attribute bits */
    BYTE mask           /* Attribute mask to change */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    DEF_NAMBUF


    res = find_volume(&path, &fs, FA_WRITE);    /* Get logical drive */
    if(res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);   /* Follow the file path */
        if(res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) {
            res = FR_INVALID_NAME;    /* Check object validity */
        }
        if(res == FR_OK) {
            mask &= AM_RDO | AM_HID | AM_SYS | AM_ARC; /* Valid attribute mask */
#if FF_FS_EXFAT
            if(fs->fs_type == FS_EXFAT) {
                fs->dirbuf[XDIR_Attr] = (attr & mask) | (fs->dirbuf[XDIR_Attr] & (BYTE)~mask);  /* Apply attribute change */
                res = store_xdir(&dj);
            } else
#endif
            {
                dj.dir[DIR_Attr] = (attr & mask) | (dj.dir[DIR_Attr] & (BYTE)~mask);    /* Apply attribute change */
                fs->wflag = 1;
            }
            if(res == FR_OK) {
                res = sync_fs(fs);
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Timestamp                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_utime(
    const TCHAR *path,  /* Pointer to the file/directory name */
    const FILINFO *fno  /* Pointer to the timestamp to be set */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    DEF_NAMBUF


    res = find_volume(&path, &fs, FA_WRITE);    /* Get logical drive */
    if(res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);   /* Follow the file path */
        if(res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) {
            res = FR_INVALID_NAME;    /* Check object validity */
        }
        if(res == FR_OK) {
#if FF_FS_EXFAT
            if(fs->fs_type == FS_EXFAT) {
                st_dword(fs->dirbuf + XDIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
                res = store_xdir(&dj);
            } else
#endif
            {
                st_dword(dj.dir + DIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
                fs->wflag = 1;
            }
            if(res == FR_OK) {
                res = sync_fs(fs);
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}

#endif  /* FF_USE_CHMOD && !FF_FS_READONLY */



#if FF_USE_LABEL
/*-----------------------------------------------------------------------*/
/* Get Volume Label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_getlabel(
    const TCHAR *path,  /* Logical drive number */
    TCHAR *label,       /* Buffer to store the volume label */
    DWORD *vsn          /* Variable to store the volume serial number */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    UINT si, di;
    WCHAR wc;

    /* Get logical drive */
    res = find_volume(&path, &fs, 0);

    /* Get volume label */
    if(res == FR_OK && label) {
        dj.obj.fs = fs;
        dj.obj.sclust = 0;  /* Open root directory */
        res = dir_sdi(&dj, 0);
        if(res == FR_OK) {
            res = DIR_READ_LABEL(&dj);      /* Find a volume label entry */
            if(res == FR_OK) {
#if FF_FS_EXFAT
                if(fs->fs_type == FS_EXFAT) {
                    WCHAR hs;

                    for(si = di = hs = 0; si < dj.dir[XDIR_NumLabel]; si++) {   /* Extract volume label from 83 entry */
                        wc = ld_word(dj.dir + XDIR_Label + si * 2);
                        if(hs == 0 && IsSurrogate(wc)) {    /* Is the code a surrogate? */
                            hs = wc;
                            continue;
                        }
                        wc = put_utf((DWORD)hs << 16 | wc, &label[di], 4);
                        if(wc == 0) {
                            di = 0;
                            break;
                        }
                        di += wc;
                        hs = 0;
                    }
                    if(hs != 0) {
                        di = 0;    /* Broken surrogate pair? */
                    }
                    label[di] = 0;
                } else
#endif
                {
                    si = di = 0;        /* Extract volume label from AM_VOL entry */
                    while(si < 11) {
                        wc = dj.dir[si++];
#if FF_USE_LFN && FF_LFN_UNICODE >= 1   /* Unicode output */
                        if(dbc_1st((BYTE)wc) && si < 11) {
                            wc = wc << 8 | dj.dir[si++];    /* Is it a DBC? */
                        }
                        wc = ff_oem2uni(wc, CODEPAGE);                  /* Convert it into Unicode */
                        if(wc != 0) {
                            wc = put_utf(wc, &label[di], 4);    /* Put it in Unicode */
                        }
                        if(wc == 0) {
                            di = 0;
                            break;
                        }
                        di += wc;
#else                                   /* ANSI/OEM output */
                        label[di++] = (TCHAR)wc;
#endif
                    }
                    do {                /* Truncate trailing spaces */
                        label[di] = 0;
                        if(di == 0) {
                            break;
                        }
                    } while(label[--di] == ' ');
                }
            }
        }
        if(res == FR_NO_FILE) {     /* No label entry and return nul string */
            label[0] = 0;
            res = FR_OK;
        }
    }

    /* Get volume serial number */
    if(res == FR_OK && vsn) {
        res = move_window(fs, fs->volbase);
        if(res == FR_OK) {
            switch(fs->fs_type) {
            case FS_EXFAT:
                di = BPB_VolIDEx;
                break;

            case FS_FAT32:
                di = BS_VolID32;
                break;

            default:
                di = BS_VolID;
            }
            *vsn = ld_dword(fs->win + di);
        }
    }

    LEAVE_FF(fs, res);
}



#if !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Set Volume Label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_setlabel(
    const TCHAR *label  /* Volume label to set with heading logical drive number */
)
{
    FRESULT res;
    DIR dj;
    FATFS *fs;
    BYTE dirvn[22];
    UINT di;
    WCHAR wc;
    static const char badchr[] = "+.,;=[]/\\\"*:<>\?|\x7F"; /* [0..] for FAT, [7..] for exFAT */
#if FF_USE_LFN
    DWORD dc;
#endif

    /* Get logical drive */
    res = find_volume(&label, &fs, FA_WRITE);
    if(res != FR_OK) {
        LEAVE_FF(fs, res);
    }

#if FF_FS_EXFAT
    if(fs->fs_type == FS_EXFAT) {   /* On the exFAT volume */
        mem_set(dirvn, 0, 22);
        di = 0;
        while((UINT)*label >= ' ') {    /* Create volume label */
            dc = tchar2uni(&label); /* Get a Unicode character */
            if(dc >= 0x10000) {
                if(dc == 0xFFFFFFFF || di >= 10) {  /* Wrong surrogate or buffer overflow */
                    dc = 0;
                } else {
                    st_word(dirvn + di * 2, (WCHAR)(dc >> 16));
                    di++;
                }
            }
            if(dc == 0 || chk_chr(badchr + 7, (int)dc) || di >= 11) {   /* Check validity of the volume label */
                LEAVE_FF(fs, FR_INVALID_NAME);
            }
            st_word(dirvn + di * 2, (WCHAR)dc);
            di++;
        }
    } else
#endif
    { /* On the FAT/FAT32 volume */
        mem_set(dirvn, ' ', 11);
        di = 0;
        while((UINT)*label >= ' ') {    /* Create volume label */
#if FF_USE_LFN
            dc = tchar2uni(&label);
            wc = (dc < 0x10000) ? ff_uni2oem(ff_wtoupper(dc), CODEPAGE) : 0;
#else                                   /* ANSI/OEM input */
            wc = (BYTE) * label++;
            if(dbc_1st((BYTE)wc)) {
                wc = dbc_2nd((BYTE) * label) ? wc << 8 | (BYTE) * label++ : 0;
            }
            if(IsLower(wc)) {
                wc -= 0x20;    /* To upper ASCII characters */
            }
#if FF_CODE_PAGE == 0
            if(ExCvt && wc >= 0x80) {
                wc = ExCvt[wc - 0x80];    /* To upper extended characters (SBCS cfg) */
            }
#elif FF_CODE_PAGE < 900
            if(wc >= 0x80) {
                wc = ExCvt[wc - 0x80];    /* To upper extended characters (SBCS cfg) */
            }
#endif
#endif
            if(wc == 0 || chk_chr(badchr + 0, (int)wc) || di >= (UINT)((wc >= 0x100) ? 10 : 11)) {  /* Reject invalid characters for volume label */
                LEAVE_FF(fs, FR_INVALID_NAME);
            }
            if(wc >= 0x100) {
                dirvn[di++] = (BYTE)(wc >> 8);
            }
            dirvn[di++] = (BYTE)wc;
        }
        if(dirvn[0] == DDEM) {
            LEAVE_FF(fs, FR_INVALID_NAME);    /* Reject illegal name (heading DDEM) */
        }
        while(di && dirvn[di - 1] == ' ') {
            di--;    /* Snip trailing spaces */
        }
    }

    /* Set volume label */
    dj.obj.fs = fs;
    dj.obj.sclust = 0;  /* Open root directory */
    res = dir_sdi(&dj, 0);
    if(res == FR_OK) {
        res = DIR_READ_LABEL(&dj);  /* Get volume label entry */
        if(res == FR_OK) {
            if(FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {
                dj.dir[XDIR_NumLabel] = (BYTE)di;   /* Change the volume label */
                mem_cpy(dj.dir + XDIR_Label, dirvn, 22);
            } else {
                if(di != 0) {
                    mem_cpy(dj.dir, dirvn, 11); /* Change the volume label */
                } else {
                    dj.dir[DIR_Name] = DDEM;    /* Remove the volume label */
                }
            }
            fs->wflag = 1;
            res = sync_fs(fs);
        } else {            /* No volume label entry or an error */
            if(res == FR_NO_FILE) {
                res = FR_OK;
                if(di != 0) {   /* Create a volume label entry */
                    res = dir_alloc(&dj, 1);    /* Allocate an entry */
                    if(res == FR_OK) {
                        mem_set(dj.dir, 0, SZDIRE); /* Clean the entry */
                        if(FF_FS_EXFAT && fs->fs_type == FS_EXFAT) {
                            dj.dir[XDIR_Type] = ET_VLABEL;  /* Create volume label entry */
                            dj.dir[XDIR_NumLabel] = (BYTE)di;
                            mem_cpy(dj.dir + XDIR_Label, dirvn, 22);
                        } else {
                            dj.dir[DIR_Attr] = AM_VOL;      /* Create volume label entry */
                            mem_cpy(dj.dir, dirvn, 11);
                        }
                        fs->wflag = 1;
                        res = sync_fs(fs);
                    }
                }
            }
        }
    }

    LEAVE_FF(fs, res);
}

#endif /* !FF_FS_READONLY */
#endif /* FF_USE_LABEL */



#if FF_USE_EXPAND && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Allocate a Contiguous Blocks to the File                              */
/*-----------------------------------------------------------------------*/

FRESULT f_expand(
    FIL *fp,        /* Pointer to the file object */
    FSIZE_t fsz,    /* File size to be expanded to */
    BYTE opt        /* Operation mode 0:Find and prepare or 1:Find and allocate */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD n, clst, stcl, scl, ncl, tcl, lclst;


    res = validate(&fp->obj, &fs);      /* Check validity of the file object */
    if(res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) {
        LEAVE_FF(fs, res);
    }
    if(fsz == 0 || fp->obj.objsize != 0 || !(fp->flag & FA_WRITE)) {
        LEAVE_FF(fs, FR_DENIED);
    }
#if FF_FS_EXFAT
    if(fs->fs_type != FS_EXFAT && fsz >= 0x100000000) {
        LEAVE_FF(fs, FR_DENIED);    /* Check if in size limit */
    }
#endif
    n = (DWORD)fs->csize * SS(fs);  /* Cluster size */
    tcl = (DWORD)(fsz / n) + ((fsz & (n - 1)) ? 1 : 0); /* Number of clusters required */
    stcl = fs->last_clst;
    lclst = 0;
    if(stcl < 2 || stcl >= fs->n_fatent) {
        stcl = 2;
    }

#if FF_FS_EXFAT
    if(fs->fs_type == FS_EXFAT) {
        scl = find_bitmap(fs, stcl, tcl);           /* Find a contiguous cluster block */
        if(scl == 0) {
            res = FR_DENIED;    /* No contiguous cluster block was found */
        }
        if(scl == 0xFFFFFFFF) {
            res = FR_DISK_ERR;
        }
        if(res == FR_OK) {  /* A contiguous free area is found */
            if(opt) {       /* Allocate it now */
                res = change_bitmap(fs, scl, tcl, 1);   /* Mark the cluster block 'in use' */
                lclst = scl + tcl - 1;
            } else {        /* Set it as suggested point for next allocation */
                lclst = scl - 1;
            }
        }
    } else
#endif
    {
        scl = clst = stcl;
        ncl = 0;
        for(;;) {   /* Find a contiguous cluster block */
            n = get_fat(&fp->obj, clst);
            if(++clst >= fs->n_fatent) {
                clst = 2;
            }
            if(n == 1) {
                res = FR_INT_ERR;
                break;
            }
            if(n == 0xFFFFFFFF) {
                res = FR_DISK_ERR;
                break;
            }
            if(n == 0) {    /* Is it a free cluster? */
                if(++ncl == tcl) {
                    break;    /* Break if a contiguous cluster block is found */
                }
            } else {
                scl = clst;
                ncl = 0;        /* Not a free cluster */
            }
            if(clst == stcl) {
                res = FR_DENIED;    /* No contiguous cluster? */
                break;
            }
        }
        if(res == FR_OK) {  /* A contiguous free area is found */
            if(opt) {       /* Allocate it now */
                for(clst = scl, n = tcl; n; clst++, n--) {  /* Create a cluster chain on the FAT */
                    res = put_fat(fs, clst, (n == 1) ? 0xFFFFFFFF : clst + 1);
                    if(res != FR_OK) {
                        break;
                    }
                    lclst = clst;
                }
            } else {        /* Set it as suggested point for next allocation */
                lclst = scl - 1;
            }
        }
    }

    if(res == FR_OK) {
        fs->last_clst = lclst;      /* Set suggested start cluster to start next */
        if(opt) {   /* Is it allocated now? */
            fp->obj.sclust = scl;       /* Update object allocation information */
            fp->obj.objsize = fsz;
            if(FF_FS_EXFAT) {
                fp->obj.stat = 2;    /* Set status 'contiguous chain' */
            }
            fp->flag |= FA_MODIFIED;
            if(fs->free_clst <= fs->n_fatent - 2) {     /* Update FSINFO */
                fs->free_clst -= tcl;
                fs->fsi_flag |= 1;
            }
        }
    }

    LEAVE_FF(fs, res);
}

#endif /* FF_USE_EXPAND && !FF_FS_READONLY */



#if FF_USE_FORWARD
/*-----------------------------------------------------------------------*/
/* Forward Data to the Stream Directly                                   */
/*-----------------------------------------------------------------------*/

FRESULT f_forward(
    FIL *fp,                        /* Pointer to the file object */
    UINT(*func)(const BYTE *, UINT), /* Pointer to the streaming function */
    UINT btf,                       /* Number of bytes to forward */
    UINT *bf                        /* Pointer to number of bytes forwarded */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD clst, sect;
    FSIZE_t remain;
    UINT rcnt, csect;
    BYTE *dbuf;


    *bf = 0;    /* Clear transfer byte counter */
    res = validate(&fp->obj, &fs);      /* Check validity of the file object */
    if(res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) {
        LEAVE_FF(fs, res);
    }
    if(!(fp->flag & FA_READ)) {
        LEAVE_FF(fs, FR_DENIED);    /* Check access mode */
    }

    remain = fp->obj.objsize - fp->fptr;
    if(btf > remain) {
        btf = (UINT)remain;    /* Truncate btf by remaining bytes */
    }

    for(;  btf && (*func)(0, 0);                     /* Repeat until all data transferred or stream goes busy */
            fp->fptr += rcnt, *bf += rcnt, btf -= rcnt) {
        csect = (UINT)(fp->fptr / SS(fs) & (fs->csize - 1));    /* Sector offset in the cluster */
        if(fp->fptr % SS(fs) == 0) {                /* On the sector boundary? */
            if(csect == 0) {                        /* On the cluster boundary? */
                clst = (fp->fptr == 0) ?            /* On the top of the file? */
                       fp->obj.sclust : get_fat(&fp->obj, fp->clust);
                if(clst <= 1) {
                    ABORT(fs, FR_INT_ERR);
                }
                if(clst == 0xFFFFFFFF) {
                    ABORT(fs, FR_DISK_ERR);
                }
                fp->clust = clst;                   /* Update current cluster */
            }
        }
        sect = clst2sect(fs, fp->clust);            /* Get current data sector */
        if(sect == 0) {
            ABORT(fs, FR_INT_ERR);
        }
        sect += csect;
#if FF_FS_TINY
        if(move_window(fs, sect) != FR_OK) {
            ABORT(fs, FR_DISK_ERR);    /* Move sector window to the file data */
        }
        dbuf = fs->win;
#else
        if(fp->sect != sect) {      /* Fill sector cache with file data */
#if !FF_FS_READONLY
            if(fp->flag & FA_DIRTY) {       /* Write-back dirty sector cache */
                if(disk_write(fs->pdrv, fp->buf, fp->sect, 1) != RES_OK) {
                    ABORT(fs, FR_DISK_ERR);
                }
                fp->flag &= (BYTE)~FA_DIRTY;
            }
#endif
            if(disk_read(fs->pdrv, fp->buf, sect, 1) != RES_OK) {
                ABORT(fs, FR_DISK_ERR);
            }
        }
        dbuf = fp->buf;
#endif
        fp->sect = sect;
        rcnt = SS(fs) - (UINT)fp->fptr % SS(fs);    /* Number of bytes left in the sector */
        if(rcnt > btf) {
            rcnt = btf;    /* Clip it by btr if needed */
        }
        rcnt = (*func)(dbuf + ((UINT)fp->fptr % SS(fs)), rcnt); /* Forward the file data */
        if(rcnt == 0) {
            ABORT(fs, FR_INT_ERR);
        }
    }

    LEAVE_FF(fs, FR_OK);
}
#endif /* FF_USE_FORWARD */



#if FF_USE_MKFS && !FF_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Create an FAT/exFAT volume                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_mkfs(
    const TCHAR *path,  /* Logical drive number */
    BYTE opt,           /* Format option */
    DWORD au,           /* Size of allocation unit (cluster) [byte] */
    void *work,         /* Pointer to working buffer (null: use heap memory) */
    UINT len            /* Size of working buffer [byte] */
)
{
    const UINT n_fats = 1;      /* Number of FATs for FAT/FAT32 volume (1 or 2) */
    const UINT n_rootdir = 512; /* Number of root directory entries for FAT volume */
    static const WORD cst[] = {1, 4, 16, 64, 256, 512, 0};  /* Cluster size boundary for FAT volume (4Ks unit) */
    static const WORD cst32[] = {1, 2, 4, 8, 16, 32, 0};    /* Cluster size boundary for FAT32 volume (128Ks unit) */
    BYTE fmt, sys, *buf, *pte, pdrv, part;
    WORD ss;    /* Sector size */
    DWORD szb_buf, sz_buf, sz_blk, n_clst, pau, sect, nsect, n;
    DWORD b_vol, b_fat, b_data;             /* Base LBA for volume, fat, data */
    DWORD sz_vol, sz_rsv, sz_fat, sz_dir;   /* Size for volume, fat, dir, data */
    UINT i;
    int vol;
    DSTATUS stat;
#if FF_USE_TRIM || FF_FS_EXFAT
    DWORD tbl[3];
#endif


    /* Check mounted drive and clear work area */
    vol = get_ldnumber(&path);                  /* Get target logical drive */
    if(vol < 0) {
        return FR_INVALID_DRIVE;
    }
    if(FatFs[vol]) {
        FatFs[vol]->fs_type = 0;    /* Clear the volume if mounted */
    }
    pdrv = LD2PD(vol);  /* Physical drive */
    part = LD2PT(vol);  /* Partition (0:create as new, 1-4:get from partition table) */

    /* Check physical drive status */
    stat = disk_initialize(pdrv);
    if(stat & STA_NOINIT) {
        return FR_NOT_READY;
    }
    if(stat & STA_PROTECT) {
        return FR_WRITE_PROTECTED;
    }
    if(disk_ioctl(pdrv, GET_BLOCK_SIZE, &sz_blk) != RES_OK || !sz_blk || sz_blk > 32768 || (sz_blk & (sz_blk - 1))) {
        sz_blk = 1;    /* Erase block to align data area */
    }
#if FF_MAX_SS != FF_MIN_SS      /* Get sector size of the medium if variable sector size cfg. */
    if(disk_ioctl(pdrv, GET_SECTOR_SIZE, &ss) != RES_OK) {
        return FR_DISK_ERR;
    }
    if(ss > FF_MAX_SS || ss < FF_MIN_SS || (ss & (ss - 1))) {
        return FR_DISK_ERR;
    }
#else
    ss = FF_MAX_SS;
#endif
    if((au != 0 && au < ss) || au > 0x1000000 || (au & (au - 1))) {
        return FR_INVALID_PARAMETER;    /* Check if au is valid */
    }
    au /= ss;   /* Cluster size in unit of sector */

    /* Get working buffer */
#if FF_USE_LFN == 3
    if(!work) {     /* Use heap memory for working buffer */
        for(szb_buf = MAX_MALLOC, buf = 0; szb_buf >= ss && (buf = ff_memalloc(szb_buf)) == 0; szb_buf /= 2) ;
        sz_buf = szb_buf / ss;      /* Size of working buffer (sector) */
    } else
#endif
    {
        buf = (BYTE *)work;     /* Working buffer */
        sz_buf = len / ss;      /* Size of working buffer (sector) */
        szb_buf = sz_buf * ss;  /* Size of working buffer (byte) */
    }
    if(!buf || sz_buf == 0) {
        return FR_NOT_ENOUGH_CORE;
    }

    /* Determine where the volume to be located (b_vol, sz_vol) */
    if(FF_MULTI_PARTITION && part != 0) {
        /* Get partition information from partition table in the MBR */
        if(disk_read(pdrv, buf, 0, 1) != RES_OK) {
            LEAVE_MKFS(FR_DISK_ERR);    /* Load MBR */
        }
        if(ld_word(buf + BS_55AA) != 0xAA55) {
            LEAVE_MKFS(FR_MKFS_ABORTED);    /* Check if MBR is valid */
        }
        pte = buf + (MBR_Table + (part - 1) * SZ_PTE);
        if(pte[PTE_System] == 0) {
            LEAVE_MKFS(FR_MKFS_ABORTED);    /* No partition? */
        }
        b_vol = ld_dword(pte + PTE_StLba);      /* Get volume start sector */
        sz_vol = ld_dword(pte + PTE_SizLba);    /* Get volume size */
    } else {
        /* Create a single-partition in this function */
        if(disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_vol) != RES_OK) {
            LEAVE_MKFS(FR_DISK_ERR);
        }
        b_vol = (opt & FM_SFD) ? 0 : 63;        /* Volume start sector */
        if(sz_vol < b_vol) {
            LEAVE_MKFS(FR_MKFS_ABORTED);
        }
        sz_vol -= b_vol;                        /* Volume size */
    }
    if(sz_vol < 128) {
        LEAVE_MKFS(FR_MKFS_ABORTED);    /* Check if volume size is >=128s */
    }

    /* Pre-determine the FAT type */
    do {
        if(FF_FS_EXFAT && (opt & FM_EXFAT)) {   /* exFAT possible? */
            if((opt & FM_ANY) == FM_EXFAT || sz_vol >= 0x4000000 || au > 128) {     /* exFAT only, vol >= 64Ms or au > 128s ? */
                fmt = FS_EXFAT;
                break;
            }
        }
        if(au > 128) {
            LEAVE_MKFS(FR_INVALID_PARAMETER);    /* Too large au for FAT/FAT32 */
        }
        if(opt & FM_FAT32) {    /* FAT32 possible? */
            if((opt & FM_ANY) == FM_FAT32 || !(opt & FM_FAT)) {     /* FAT32 only or no-FAT? */
                fmt = FS_FAT32;
                break;
            }
        }
        if(!(opt & FM_FAT)) {
            LEAVE_MKFS(FR_INVALID_PARAMETER);    /* no-FAT? */
        }
        fmt = FS_FAT16;
    } while(0);

#if FF_FS_EXFAT
    if(fmt == FS_EXFAT) {   /* Create an exFAT volume */
        DWORD szb_bit, szb_case, sum, nb, cl;
        WCHAR ch, si;
        UINT j, st;
        BYTE b;

        if(sz_vol < 0x1000) {
            LEAVE_MKFS(FR_MKFS_ABORTED);    /* Too small volume? */
        }
#if FF_USE_TRIM
        tbl[0] = b_vol;
        tbl[1] = b_vol + sz_vol - 1;    /* Inform the device the volume area may be erased */
        disk_ioctl(pdrv, CTRL_TRIM, tbl);
#endif
        /* Determine FAT location, data location and number of clusters */
        if(au == 0) {   /* au auto-selection */
            au = 8;
            if(sz_vol >= 0x80000) {
                au = 64;    /* >= 512Ks */
            }
            if(sz_vol >= 0x4000000) {
                au = 256;    /* >= 64Ms */
            }
        }
        b_fat = b_vol + 32;                                     /* FAT start at offset 32 */
        sz_fat = ((sz_vol / au + 2) * 4 + ss - 1) / ss;         /* Number of FAT sectors */
        b_data = (b_fat + sz_fat + sz_blk - 1) & ~(sz_blk - 1); /* Align data area to the erase block boundary */
        if(b_data >= sz_vol / 2) {
            LEAVE_MKFS(FR_MKFS_ABORTED);    /* Too small volume? */
        }
        n_clst = (sz_vol - (b_data - b_vol)) / au;              /* Number of clusters */
        if(n_clst < 16) {
            LEAVE_MKFS(FR_MKFS_ABORTED);    /* Too few clusters? */
        }
        if(n_clst > MAX_EXFAT) {
            LEAVE_MKFS(FR_MKFS_ABORTED);    /* Too many clusters? */
        }

        szb_bit = (n_clst + 7) / 8;                     /* Size of allocation bitmap */
        tbl[0] = (szb_bit + au * ss - 1) / (au * ss);   /* Number of allocation bitmap clusters */

        /* Create a compressed up-case table */
        sect = b_data + au * tbl[0];    /* Table start sector */
        sum = 0;                        /* Table checksum to be stored in the 82 entry */
        st = 0;
        si = 0;
        i = 0;
        j = 0;
        szb_case = 0;
        do {
            switch(st) {
            case 0:
                ch = (WCHAR)ff_wtoupper(si);    /* Get an up-case char */
                if(ch != si) {
                    si++;
                    break;        /* Store the up-case char if exist */
                }
                for(j = 1; (WCHAR)(si + j) && (WCHAR)(si + j) == ff_wtoupper((WCHAR)(si + j)); j++) ;   /* Get run length of no-case block */
                if(j >= 128) {
                    ch = 0xFFFF;
                    st = 2;
                    break; /* Compress the no-case block if run is >= 128 */
                }
                st = 1;         /* Do not compress short run */
            /* go to next case */
            case 1:
                ch = si++;      /* Fill the short run */
                if(--j == 0) {
                    st = 0;
                }
                break;

            default:
                ch = (WCHAR)j;
                si += (WCHAR)j;  /* Number of chars to skip */
                st = 0;
            }
            sum = xsum32(buf[i + 0] = (BYTE)ch, sum);       /* Put it into the write buffer */
            sum = xsum32(buf[i + 1] = (BYTE)(ch >> 8), sum);
            i += 2;
            szb_case += 2;
            if(si == 0 || i == szb_buf) {       /* Write buffered data when buffer full or end of process */
                n = (i + ss - 1) / ss;
                if(disk_write(pdrv, buf, sect, n) != RES_OK) {
                    LEAVE_MKFS(FR_DISK_ERR);
                }
                sect += n;
                i = 0;
            }
        } while(si);
        tbl[1] = (szb_case + au * ss - 1) / (au * ss);  /* Number of up-case table clusters */
        tbl[2] = 1;                                     /* Number of root dir clusters */

        /* Initialize the allocation bitmap */
        sect = b_data;
        nsect = (szb_bit + ss - 1) / ss; /* Start of bitmap and number of sectors */
        nb = tbl[0] + tbl[1] + tbl[2];                  /* Number of clusters in-use by system */
        do {
            mem_set(buf, 0, szb_buf);
            for(i = 0; nb >= 8 && i < szb_buf; buf[i++] = 0xFF, nb -= 8) ;
            for(b = 1; nb != 0 && i < szb_buf; buf[i] |= b, b <<= 1, nb--) ;
            n = (nsect > sz_buf) ? sz_buf : nsect;      /* Write the buffered data */
            if(disk_write(pdrv, buf, sect, n) != RES_OK) {
                LEAVE_MKFS(FR_DISK_ERR);
            }
            sect += n;
            nsect -= n;
        } while(nsect);

        /* Initialize the FAT */
        sect = b_fat;
        nsect = sz_fat;   /* Start of FAT and number of FAT sectors */
        j = nb = cl = 0;
        do {
            mem_set(buf, 0, szb_buf);
            i = 0;    /* Clear work area and reset write index */
            if(cl == 0) {   /* Set entry 0 and 1 */
                st_dword(buf + i, 0xFFFFFFF8);
                i += 4;
                cl++;
                st_dword(buf + i, 0xFFFFFFFF);
                i += 4;
                cl++;
            }
            do {            /* Create chains of bitmap, up-case and root dir */
                while(nb != 0 && i < szb_buf) {             /* Create a chain */
                    st_dword(buf + i, (nb > 1) ? cl + 1 : 0xFFFFFFFF);
                    i += 4;
                    cl++;
                    nb--;
                }
                if(nb == 0 && j < 3) {
                    nb = tbl[j++];    /* Next chain */
                }
            } while(nb != 0 && i < szb_buf);
            n = (nsect > sz_buf) ? sz_buf : nsect;  /* Write the buffered data */
            if(disk_write(pdrv, buf, sect, n) != RES_OK) {
                LEAVE_MKFS(FR_DISK_ERR);
            }
            sect += n;
            nsect -= n;
        } while(nsect);

        /* Initialize the root directory */
        mem_set(buf, 0, szb_buf);
        buf[SZDIRE * 0 + 0] = ET_VLABEL;        /* Volume label entry */
        buf[SZDIRE * 1 + 0] = ET_BITMAP;        /* Bitmap entry */
        st_dword(buf + SZDIRE * 1 + 20, 2);             /* cluster */
        st_dword(buf + SZDIRE * 1 + 24, szb_bit);       /* size */
        buf[SZDIRE * 2 + 0] = ET_UPCASE;        /* Up-case table entry */
        st_dword(buf + SZDIRE * 2 + 4, sum);            /* sum */
        st_dword(buf + SZDIRE * 2 + 20, 2 + tbl[0]);    /* cluster */
        st_dword(buf + SZDIRE * 2 + 24, szb_case);      /* size */
        sect = b_data + au * (tbl[0] + tbl[1]);
        nsect = au; /* Start of the root directory and number of sectors */
        do {    /* Fill root directory sectors */
            n = (nsect > sz_buf) ? sz_buf : nsect;
            if(disk_write(pdrv, buf, sect, n) != RES_OK) {
                LEAVE_MKFS(FR_DISK_ERR);
            }
            mem_set(buf, 0, ss);
            sect += n;
            nsect -= n;
        } while(nsect);

        /* Create two set of the exFAT VBR blocks */
        sect = b_vol;
        for(n = 0; n < 2; n++) {
            /* Main record (+0) */
            mem_set(buf, 0, ss);
            mem_cpy(buf + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11);   /* Boot jump code (x86), OEM name */
            st_dword(buf + BPB_VolOfsEx, b_vol);                    /* Volume offset in the physical drive [sector] */
            st_dword(buf + BPB_TotSecEx, sz_vol);                   /* Volume size [sector] */
            st_dword(buf + BPB_FatOfsEx, b_fat - b_vol);            /* FAT offset [sector] */
            st_dword(buf + BPB_FatSzEx, sz_fat);                    /* FAT size [sector] */
            st_dword(buf + BPB_DataOfsEx, b_data - b_vol);          /* Data offset [sector] */
            st_dword(buf + BPB_NumClusEx, n_clst);                  /* Number of clusters */
            st_dword(buf + BPB_RootClusEx, 2 + tbl[0] + tbl[1]);    /* Root dir cluster # */
            st_dword(buf + BPB_VolIDEx, GET_FATTIME());             /* VSN */
            st_word(buf + BPB_FSVerEx, 0x100);                      /* Filesystem version (1.00) */
            for(buf[BPB_BytsPerSecEx] = 0, i = ss; i >>= 1; buf[BPB_BytsPerSecEx]++) ;  /* Log2 of sector size [byte] */
            for(buf[BPB_SecPerClusEx] = 0, i = au; i >>= 1; buf[BPB_SecPerClusEx]++) ;  /* Log2 of cluster size [sector] */
            buf[BPB_NumFATsEx] = 1;                 /* Number of FATs */
            buf[BPB_DrvNumEx] = 0x80;               /* Drive number (for int13) */
            st_word(buf + BS_BootCodeEx, 0xFEEB);   /* Boot code (x86) */
            st_word(buf + BS_55AA, 0xAA55);         /* Signature (placed here regardless of sector size) */
            for(i = sum = 0; i < ss; i++) {         /* VBR checksum */
                if(i != BPB_VolFlagEx && i != BPB_VolFlagEx + 1 && i != BPB_PercInUseEx) {
                    sum = xsum32(buf[i], sum);
                }
            }
            if(disk_write(pdrv, buf, sect++, 1) != RES_OK) {
                LEAVE_MKFS(FR_DISK_ERR);
            }
            /* Extended bootstrap record (+1..+8) */
            mem_set(buf, 0, ss);
            st_word(buf + ss - 2, 0xAA55);  /* Signature (placed at end of sector) */
            for(j = 1; j < 9; j++) {
                for(i = 0; i < ss; sum = xsum32(buf[i++], sum)) ;   /* VBR checksum */
                if(disk_write(pdrv, buf, sect++, 1) != RES_OK) {
                    LEAVE_MKFS(FR_DISK_ERR);
                }
            }
            /* OEM/Reserved record (+9..+10) */
            mem_set(buf, 0, ss);
            for(; j < 11; j++) {
                for(i = 0; i < ss; sum = xsum32(buf[i++], sum)) ;   /* VBR checksum */
                if(disk_write(pdrv, buf, sect++, 1) != RES_OK) {
                    LEAVE_MKFS(FR_DISK_ERR);
                }
            }
            /* Sum record (+11) */
            for(i = 0; i < ss; i += 4) {
                st_dword(buf + i, sum);    /* Fill with checksum value */
            }
            if(disk_write(pdrv, buf, sect++, 1) != RES_OK) {
                LEAVE_MKFS(FR_DISK_ERR);
            }
        }

    } else
#endif  /* FF_FS_EXFAT */
    { /* Create an FAT/FAT32 volume */
        do {
            pau = au;
            /* Pre-determine number of clusters and FAT sub-type */
            if(fmt == FS_FAT32) {   /* FAT32 volume */
                if(pau == 0) {  /* au auto-selection */
                    n = sz_vol / 0x20000;   /* Volume size in unit of 128KS */
                    for(i = 0, pau = 1; cst32[i] && cst32[i] <= n; i++, pau <<= 1) ;    /* Get from table */
                }
                n_clst = sz_vol / pau;  /* Number of clusters */
                sz_fat = (n_clst * 4 + 8 + ss - 1) / ss;    /* FAT size [sector] */
                sz_rsv = 32;    /* Number of reserved sectors */
                sz_dir = 0;     /* No static directory */
                if(n_clst <= MAX_FAT16 || n_clst > MAX_FAT32) {
                    LEAVE_MKFS(FR_MKFS_ABORTED);
                }
            } else {                /* FAT volume */
                if(pau == 0) {  /* au auto-selection */
                    n = sz_vol / 0x1000;    /* Volume size in unit of 4KS */
                    for(i = 0, pau = 1; cst[i] && cst[i] <= n; i++, pau <<= 1) ;    /* Get from table */
                }
                n_clst = sz_vol / pau;
                if(n_clst > MAX_FAT12) {
                    n = n_clst * 2 + 4;     /* FAT size [byte] */
                } else {
                    fmt = FS_FAT12;
                    n = (n_clst * 3 + 1) / 2 + 3;   /* FAT size [byte] */
                }
                sz_fat = (n + ss - 1) / ss;     /* FAT size [sector] */
                sz_rsv = 1;                     /* Number of reserved sectors */
                sz_dir = (DWORD)n_rootdir * SZDIRE / ss;    /* Rootdir size [sector] */
            }
            b_fat = b_vol + sz_rsv;                     /* FAT base */
            b_data = b_fat + sz_fat * n_fats + sz_dir;  /* Data base */

            /* Align data base to erase block boundary (for flash memory media) */
            n = ((b_data + sz_blk - 1) & ~(sz_blk - 1)) - b_data;   /* Next nearest erase block from current data base */
            if(fmt == FS_FAT32) {       /* FAT32: Move FAT base */
                sz_rsv += n;
                b_fat += n;
            } else {                    /* FAT: Expand FAT size */
                sz_fat += n / n_fats;
            }

            /* Determine number of clusters and final check of validity of the FAT sub-type */
            if(sz_vol < b_data + pau * 16 - b_vol) {
                LEAVE_MKFS(FR_MKFS_ABORTED);    /* Too small volume */
            }
            n_clst = (sz_vol - sz_rsv - sz_fat * n_fats - sz_dir) / pau;
            if(fmt == FS_FAT32) {
                if(n_clst <= MAX_FAT16) {   /* Too few clusters for FAT32 */
                    if(au == 0 && (au = pau / 2) != 0) {
                        continue;    /* Adjust cluster size and retry */
                    }
                    LEAVE_MKFS(FR_MKFS_ABORTED);
                }
            }
            if(fmt == FS_FAT16) {
                if(n_clst > MAX_FAT16) {    /* Too many clusters for FAT16 */
                    if(au == 0 && (pau * 2) <= 64) {
                        au = pau * 2;
                        continue;     /* Adjust cluster size and retry */
                    }
                    if((opt & FM_FAT32)) {
                        fmt = FS_FAT32;
                        continue;   /* Switch type to FAT32 and retry */
                    }
                    if(au == 0 && (au = pau * 2) <= 128) {
                        continue;    /* Adjust cluster size and retry */
                    }
                    LEAVE_MKFS(FR_MKFS_ABORTED);
                }
                if(n_clst <= MAX_FAT12) {   /* Too few clusters for FAT16 */
                    if(au == 0 && (au = pau * 2) <= 128) {
                        continue;    /* Adjust cluster size and retry */
                    }
                    LEAVE_MKFS(FR_MKFS_ABORTED);
                }
            }
            if(fmt == FS_FAT12 && n_clst > MAX_FAT12) {
                LEAVE_MKFS(FR_MKFS_ABORTED);    /* Too many clusters for FAT12 */
            }

            /* Ok, it is the valid cluster configuration */
            break;
        } while(1);

#if FF_USE_TRIM
        tbl[0] = b_vol;
        tbl[1] = b_vol + sz_vol - 1;    /* Inform the device the volume area can be erased */
        disk_ioctl(pdrv, CTRL_TRIM, tbl);
#endif
        /* Create FAT VBR */
        mem_set(buf, 0, ss);
        mem_cpy(buf + BS_JmpBoot, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot jump code (x86), OEM name */
        st_word(buf + BPB_BytsPerSec, ss);              /* Sector size [byte] */
        buf[BPB_SecPerClus] = (BYTE)pau;                /* Cluster size [sector] */
        st_word(buf + BPB_RsvdSecCnt, (WORD)sz_rsv);    /* Size of reserved area */
        buf[BPB_NumFATs] = (BYTE)n_fats;                /* Number of FATs */
        st_word(buf + BPB_RootEntCnt, (WORD)((fmt == FS_FAT32) ? 0 : n_rootdir));   /* Number of root directory entries */
        if(sz_vol < 0x10000) {
            st_word(buf + BPB_TotSec16, (WORD)sz_vol);  /* Volume size in 16-bit LBA */
        } else {
            st_dword(buf + BPB_TotSec32, sz_vol);       /* Volume size in 32-bit LBA */
        }
        buf[BPB_Media] = 0xF8;                          /* Media descriptor byte */
        st_word(buf + BPB_SecPerTrk, 63);               /* Number of sectors per track (for int13) */
        st_word(buf + BPB_NumHeads, 255);               /* Number of heads (for int13) */
        st_dword(buf + BPB_HiddSec, b_vol);             /* Volume offset in the physical drive [sector] */
        if(fmt == FS_FAT32) {
            st_dword(buf + BS_VolID32, GET_FATTIME());  /* VSN */
            st_dword(buf + BPB_FATSz32, sz_fat);        /* FAT size [sector] */
            st_dword(buf + BPB_RootClus32, 2);          /* Root directory cluster # (2) */
            st_word(buf + BPB_FSInfo32, 1);             /* Offset of FSINFO sector (VBR + 1) */
            st_word(buf + BPB_BkBootSec32, 6);          /* Offset of backup VBR (VBR + 6) */
            buf[BS_DrvNum32] = 0x80;                    /* Drive number (for int13) */
            buf[BS_BootSig32] = 0x29;                   /* Extended boot signature */
            mem_cpy(buf + BS_VolLab32, "NO NAME    " "FAT32   ", 19);   /* Volume label, FAT signature */
        } else {
            st_dword(buf + BS_VolID, GET_FATTIME());    /* VSN */
            st_word(buf + BPB_FATSz16, (WORD)sz_fat);   /* FAT size [sector] */
            buf[BS_DrvNum] = 0x80;                      /* Drive number (for int13) */
            buf[BS_BootSig] = 0x29;                     /* Extended boot signature */
            mem_cpy(buf + BS_VolLab, "NO NAME    " "FAT     ", 19); /* Volume label, FAT signature */
        }
        st_word(buf + BS_55AA, 0xAA55);                 /* Signature (offset is fixed here regardless of sector size) */
        if(disk_write(pdrv, buf, b_vol, 1) != RES_OK) {
            LEAVE_MKFS(FR_DISK_ERR);    /* Write it to the VBR sector */
        }

        /* Create FSINFO record if needed */
        if(fmt == FS_FAT32) {
            disk_write(pdrv, buf, b_vol + 6, 1);        /* Write backup VBR (VBR + 6) */
            mem_set(buf, 0, ss);
            st_dword(buf + FSI_LeadSig, 0x41615252);
            st_dword(buf + FSI_StrucSig, 0x61417272);
            st_dword(buf + FSI_Free_Count, n_clst - 1); /* Number of free clusters */
            st_dword(buf + FSI_Nxt_Free, 2);            /* Last allocated cluster# */
            st_word(buf + BS_55AA, 0xAA55);
            disk_write(pdrv, buf, b_vol + 7, 1);        /* Write backup FSINFO (VBR + 7) */
            disk_write(pdrv, buf, b_vol + 1, 1);        /* Write original FSINFO (VBR + 1) */
        }

        /* Initialize FAT area */
        mem_set(buf, 0, (UINT)szb_buf);
        sect = b_fat;       /* FAT start sector */
        for(i = 0; i < n_fats; i++) {           /* Initialize FATs each */
            if(fmt == FS_FAT32) {
                st_dword(buf + 0, 0xFFFFFFF8);  /* Entry 0 */
                st_dword(buf + 4, 0xFFFFFFFF);  /* Entry 1 */
                st_dword(buf + 8, 0x0FFFFFFF);  /* Entry 2 (root directory) */
            } else {
                st_dword(buf + 0, (fmt == FS_FAT12) ? 0xFFFFF8 : 0xFFFFFFF8);   /* Entry 0 and 1 */
            }
            nsect = sz_fat;     /* Number of FAT sectors */
            do {    /* Fill FAT sectors */
                n = (nsect > sz_buf) ? sz_buf : nsect;
                if(disk_write(pdrv, buf, sect, (UINT)n) != RES_OK) {
                    LEAVE_MKFS(FR_DISK_ERR);
                }
                mem_set(buf, 0, ss);
                sect += n;
                nsect -= n;
            } while(nsect);
        }

        /* Initialize root directory (fill with zero) */
        nsect = (fmt == FS_FAT32) ? pau : sz_dir;   /* Number of root directory sectors */
        do {
            n = (nsect > sz_buf) ? sz_buf : nsect;
            if(disk_write(pdrv, buf, sect, (UINT)n) != RES_OK) {
                LEAVE_MKFS(FR_DISK_ERR);
            }
            sect += n;
            nsect -= n;
        } while(nsect);
    }

    /* Determine system ID in the partition table */
    if(FF_FS_EXFAT && fmt == FS_EXFAT) {
        sys = 0x07;         /* HPFS/NTFS/exFAT */
    } else {
        if(fmt == FS_FAT32) {
            sys = 0x0C;     /* FAT32X */
        } else {
            if(sz_vol >= 0x10000) {
                sys = 0x06; /* FAT12/16 (large) */
            } else {
                sys = (fmt == FS_FAT16) ? 0x04 : 0x01;  /* FAT16 : FAT12 */
            }
        }
    }

    /* Update partition information */
    if(FF_MULTI_PARTITION && part != 0) {   /* Created in the existing partition */
        /* Update system ID in the partition table */
        if(disk_read(pdrv, buf, 0, 1) != RES_OK) {
            LEAVE_MKFS(FR_DISK_ERR);    /* Read the MBR */
        }
        buf[MBR_Table + (part - 1) * SZ_PTE + PTE_System] = sys;        /* Set system ID */
        if(disk_write(pdrv, buf, 0, 1) != RES_OK) {
            LEAVE_MKFS(FR_DISK_ERR);    /* Write it back to the MBR */
        }
    } else {                                /* Created as a new single partition */
        if(!(opt & FM_SFD)) {   /* Create partition table if in FDISK format */
            mem_set(buf, 0, ss);
            st_word(buf + BS_55AA, 0xAA55);     /* MBR signature */
            pte = buf + MBR_Table;              /* Create partition table for single partition in the drive */
            pte[PTE_Boot] = 0;                  /* Boot indicator */
            pte[PTE_StHead] = 1;                /* Start head */
            pte[PTE_StSec] = 1;                 /* Start sector */
            pte[PTE_StCyl] = 0;                 /* Start cylinder */
            pte[PTE_System] = sys;              /* System type */
            n = (b_vol + sz_vol) / (63 * 255);  /* (End CHS may be invalid) */
            pte[PTE_EdHead] = 254;              /* End head */
            pte[PTE_EdSec] = (BYTE)(((n >> 2) & 0xC0) | 63);    /* End sector */
            pte[PTE_EdCyl] = (BYTE)n;           /* End cylinder */
            st_dword(pte + PTE_StLba, b_vol);   /* Start offset in LBA */
            st_dword(pte + PTE_SizLba, sz_vol); /* Size in sectors */
            if(disk_write(pdrv, buf, 0, 1) != RES_OK) {
                LEAVE_MKFS(FR_DISK_ERR);    /* Write it to the MBR */
            }
        }
    }

    if(disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) {
        LEAVE_MKFS(FR_DISK_ERR);
    }

    LEAVE_MKFS(FR_OK);
}



#if FF_MULTI_PARTITION
/*-----------------------------------------------------------------------*/
/* Create Partition Table on the Physical Drive                          */
/*-----------------------------------------------------------------------*/

FRESULT f_fdisk(
    BYTE pdrv,          /* Physical drive number */
    const DWORD *szt,   /* Pointer to the size table for each partitions */
    void *work          /* Pointer to the working buffer (null: use heap memory) */
)
{
    UINT i, n, sz_cyl, tot_cyl, b_cyl, e_cyl, p_cyl;
    BYTE s_hd, e_hd, *p, *buf = (BYTE *)work;
    DSTATUS stat;
    DWORD sz_disk, sz_part, s_part;
    FRESULT res;


    stat = disk_initialize(pdrv);
    if(stat & STA_NOINIT) {
        return FR_NOT_READY;
    }
    if(stat & STA_PROTECT) {
        return FR_WRITE_PROTECTED;
    }
    if(disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk)) {
        return FR_DISK_ERR;
    }

    buf = (BYTE *)work;
#if FF_USE_LFN == 3
    if(!buf) {
        buf = ff_memalloc(FF_MAX_SS);    /* Use heap memory for working buffer */
    }
#endif
    if(!buf) {
        return FR_NOT_ENOUGH_CORE;
    }

    /* Determine the CHS without any consideration of the drive geometry */
    for(n = 16; n < 256 && sz_disk / n / 63 > 1024; n *= 2) ;
    if(n == 256) {
        n--;
    }
    e_hd = (BYTE)(n - 1);
    sz_cyl = 63 * n;
    tot_cyl = sz_disk / sz_cyl;

    /* Create partition table */
    mem_set(buf, 0, FF_MAX_SS);
    p = buf + MBR_Table;
    b_cyl = 0;
    for(i = 0; i < 4; i++, p += SZ_PTE) {
        p_cyl = (szt[i] <= 100U) ? (DWORD)tot_cyl * szt[i] / 100 : szt[i] / sz_cyl; /* Number of cylinders */
        if(p_cyl == 0) {
            continue;
        }
        s_part = (DWORD)sz_cyl * b_cyl;
        sz_part = (DWORD)sz_cyl * p_cyl;
        if(i == 0) {    /* Exclude first track of cylinder 0 */
            s_hd = 1;
            s_part += 63;
            sz_part -= 63;
        } else {
            s_hd = 0;
        }
        e_cyl = b_cyl + p_cyl - 1;  /* End cylinder */
        if(e_cyl >= tot_cyl) {
            LEAVE_MKFS(FR_INVALID_PARAMETER);
        }

        /* Set partition table */
        p[1] = s_hd;                        /* Start head */
        p[2] = (BYTE)(((b_cyl >> 2) & 0xC0) | 1);   /* Start sector */
        p[3] = (BYTE)b_cyl;                 /* Start cylinder */
        p[4] = 0x07;                        /* System type (temporary setting) */
        p[5] = e_hd;                        /* End head */
        p[6] = (BYTE)(((e_cyl >> 2) & 0xC0) | 63);  /* End sector */
        p[7] = (BYTE)e_cyl;                 /* End cylinder */
        st_dword(p + 8, s_part);            /* Start sector in LBA */
        st_dword(p + 12, sz_part);          /* Number of sectors */

        /* Next partition */
        b_cyl += p_cyl;
    }
    st_word(p, 0xAA55);     /* MBR signature (always at offset 510) */

    /* Write it to the MBR */
    res = (disk_write(pdrv, buf, 0, 1) == RES_OK && disk_ioctl(pdrv, CTRL_SYNC, 0) == RES_OK) ? FR_OK : FR_DISK_ERR;
    LEAVE_MKFS(res);
}

#endif /* FF_MULTI_PARTITION */
#endif /* FF_USE_MKFS && !FF_FS_READONLY */




#if FF_USE_STRFUNC
#if FF_USE_LFN && FF_LFN_UNICODE && (FF_STRF_ENCODE < 0 || FF_STRF_ENCODE > 3)
#error Wrong FF_STRF_ENCODE setting
#endif
/*-----------------------------------------------------------------------*/
/* Get a String from the File                                            */
/*-----------------------------------------------------------------------*/

TCHAR *f_gets(
    TCHAR *buff,    /* Pointer to the string buffer to read */
    int len,        /* Size of string buffer (items) */
    FIL *fp         /* Pointer to the file object */
)
{
    int nc = 0;
    TCHAR *p = buff;
    BYTE s[4];
    UINT rc;
    DWORD dc;
#if FF_USE_LFN && FF_LFN_UNICODE && FF_STRF_ENCODE <= 2
    WCHAR wc;
#endif
#if FF_USE_LFN && FF_LFN_UNICODE && FF_STRF_ENCODE == 3
    UINT ct;
#endif

#if FF_USE_LFN && FF_LFN_UNICODE            /* With code conversion (Unicode API) */
    /* Make a room for the character and terminator  */
    if(FF_LFN_UNICODE == 1) {
        len -= (FF_STRF_ENCODE == 0) ? 1 : 2;
    }
    if(FF_LFN_UNICODE == 2) {
        len -= (FF_STRF_ENCODE == 0) ? 3 : 4;
    }
    if(FF_LFN_UNICODE == 3) {
        len -= 1;
    }
    while(nc < len) {
#if FF_STRF_ENCODE == 0     /* Read a character in ANSI/OEM */
        f_read(fp, s, 1, &rc);
        if(rc != 1) {
            break;
        }
        wc = s[0];
        if(dbc_1st((BYTE)wc)) {
            f_read(fp, s, 1, &rc);
            if(rc != 1 || !dbc_2nd(s[0])) {
                continue;
            }
            wc = wc << 8 | s[0];
        }
        dc = ff_oem2uni(wc, CODEPAGE);
        if(dc == 0) {
            continue;
        }
#elif FF_STRF_ENCODE == 1 || FF_STRF_ENCODE == 2    /* Read a character in UTF-16LE/BE */
        f_read(fp, s, 2, &rc);
        if(rc != 2) {
            break;
        }
        dc = (FF_STRF_ENCODE == 1) ? ld_word(s) : s[0] << 8 | s[1];
        if(IsSurrogateL(dc)) {
            continue;
        }
        if(IsSurrogateH(dc)) {
            f_read(fp, s, 2, &rc);
            if(rc != 2) {
                break;
            }
            wc = (FF_STRF_ENCODE == 1) ? ld_word(s) : s[0] << 8 | s[1];
            if(!IsSurrogateL(wc)) {
                continue;
            }
            dc = ((dc & 0x3FF) + 0x40) << 10 | (wc & 0x3FF);
        }
#else   /* Read a character in UTF-8 */
        f_read(fp, s, 1, &rc);
        if(rc != 1) {
            break;
        }
        dc = s[0];
        if(dc >= 0x80) {    /* Multi-byte character? */
            ct = 0;
            if((dc & 0xE0) == 0xC0) {
                dc &= 0x1F;    /* 2-byte? */
                ct = 1;
            }
            if((dc & 0xF0) == 0xE0) {
                dc &= 0x0F;    /* 3-byte? */
                ct = 2;
            }
            if((dc & 0xF8) == 0xF0) {
                dc &= 0x07;    /* 4-byte? */
                ct = 3;
            }
            if(ct == 0) {
                continue;
            }
            f_read(fp, s, ct, &rc);     /* Get trailing bytes */
            if(rc != ct) {
                break;
            }
            rc = 0;
            do {    /* Merge trailing bytes */
                if((s[rc] & 0xC0) != 0x80) {
                    break;
                }
                dc = dc << 6 | (s[rc] & 0x3F);
            } while(++rc < ct);
            if(rc != ct || dc < 0x80 || IsSurrogate(dc) || dc >= 0x110000) {
                continue;    /* Wrong encoding? */
            }
        }
#endif
        if(FF_USE_STRFUNC == 2 && dc == '\r') {
            continue;    /* Strip \r off if needed */
        }
#if FF_LFN_UNICODE == 1 || FF_LFN_UNICODE == 3  /* Output it in UTF-16/32 encoding */
        if(FF_LFN_UNICODE == 1 && dc >= 0x10000) {  /* Out of BMP at UTF-16? */
            *p++ = (TCHAR)(0xD800 | ((dc >> 10) - 0x40));
            nc++; /* Make and output high surrogate */
            dc = 0xDC00 | (dc & 0x3FF);     /* Make low surrogate */
        }
        *p++ = (TCHAR)dc;
        nc++;
        if(dc == '\n') {
            break;    /* End of line? */
        }
#elif FF_LFN_UNICODE == 2       /* Output it in UTF-8 encoding */
        if(dc < 0x80) {     /* 1-byte */
            *p++ = (TCHAR)dc;
            nc++;
            if(dc == '\n') {
                break;    /* End of line? */
            }
        } else {
            if(dc < 0x800) {        /* 2-byte */
                *p++ = (TCHAR)(0xC0 | (dc >> 6 & 0x1F));
                *p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
                nc += 2;
            } else {
                if(dc < 0x10000) {  /* 3-byte */
                    *p++ = (TCHAR)(0xE0 | (dc >> 12 & 0x0F));
                    *p++ = (TCHAR)(0x80 | (dc >> 6 & 0x3F));
                    *p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
                    nc += 3;
                } else {            /* 4-byte */
                    *p++ = (TCHAR)(0xF0 | (dc >> 18 & 0x07));
                    *p++ = (TCHAR)(0x80 | (dc >> 12 & 0x3F));
                    *p++ = (TCHAR)(0x80 | (dc >> 6 & 0x3F));
                    *p++ = (TCHAR)(0x80 | (dc >> 0 & 0x3F));
                    nc += 4;
                }
            }
        }
#endif
    }

#else           /* Byte-by-byte without any conversion (ANSI/OEM API) */
    len -= 1;   /* Make a room for the terminator */
    while(nc < len) {
        f_read(fp, s, 1, &rc);
        if(rc != 1) {
            break;
        }
        dc = s[0];
        if(FF_USE_STRFUNC == 2 && dc == '\r') {
            continue;
        }
        *p++ = (TCHAR)dc;
        nc++;
        if(dc == '\n') {
            break;
        }
    }
#endif

    *p = 0;     /* Terminate the string */
    return nc ? buff : 0;   /* When no data read due to EOF or error, return with error. */
}




#if !FF_FS_READONLY
#include <stdarg.h>
/*-----------------------------------------------------------------------*/
/* Put a Character to the File                                           */
/*-----------------------------------------------------------------------*/

typedef struct {    /* Putchar output buffer and work area */
    FIL *fp;        /* Ptr to the writing file */
    int idx, nchr;  /* Write index of buf[] (-1:error), number of encoding units written */
#if FF_USE_LFN && FF_LFN_UNICODE == 1
    WCHAR hs;
#elif FF_USE_LFN && FF_LFN_UNICODE == 2
    BYTE bs[4];
    UINT wi, ct;
#endif
    BYTE buf[64];   /* Write buffer */
} putbuff;


static void putc_bfd(   /* Buffered write with code conversion */
    putbuff *pb,
    TCHAR c
)
{
    UINT n;
    int i, nc;
#if FF_USE_LFN && FF_LFN_UNICODE
    WCHAR hs, wc;
#if FF_LFN_UNICODE == 2
    DWORD dc;
    TCHAR *tp;
#endif
#endif

    if(FF_USE_STRFUNC == 2 && c == '\n') {   /* LF -> CRLF conversion */
        putc_bfd(pb, '\r');
    }

    i = pb->idx;            /* Write index of pb->buf[] */
    if(i < 0) {
        return;
    }
    nc = pb->nchr;          /* Write unit counter */

#if FF_USE_LFN && FF_LFN_UNICODE
#if FF_LFN_UNICODE == 1     /* UTF-16 input */
    if(IsSurrogateH(c)) {
        pb->hs = c;
        return;
    }
    hs = pb->hs;
    pb->hs = 0;
    if(hs != 0) {
        if(!IsSurrogateL(c)) {
            hs = 0;
        }
    } else {
        if(IsSurrogateL(c)) {
            return;
        }
    }
    wc = c;
#elif FF_LFN_UNICODE == 2   /* UTF-8 input */
    for(;;) {
        if(pb->ct == 0) {   /* Out of multi-byte sequence? */
            pb->bs[pb->wi = 0] = (BYTE)c;   /* Save 1st byte */
            if((BYTE)c < 0x80) {
                break;    /* 1-byte? */
            }
            if(((BYTE)c & 0xE0) == 0xC0) {
                pb->ct = 1;    /* 2-byte? */
            }
            if(((BYTE)c & 0xF0) == 0xE0) {
                pb->ct = 2;    /* 3-byte? */
            }
            if(((BYTE)c & 0xF1) == 0xF0) {
                pb->ct = 3;    /* 4-byte? */
            }
            return;
        } else {                /* In the multi-byte sequence */
            if(((BYTE)c & 0xC0) != 0x80) {  /* Broken sequence? */
                pb->ct = 0;
                continue;
            }
            pb->bs[++pb->wi] = (BYTE)c; /* Save the trailing byte */
            if(--pb->ct == 0) {
                break;    /* End of multi-byte sequence? */
            }
            return;
        }
    }
    tp = (TCHAR *)pb->bs;
    dc = tchar2uni(&tp);    /* UTF-8 ==> UTF-16 */
    if(dc == 0xFFFFFFFF) {
        return;
    }
    wc = (WCHAR)dc;
    hs = (WCHAR)(dc >> 16);
#elif FF_LFN_UNICODE == 3   /* UTF-32 input */
    if(IsSurrogate(c) || c >= 0x110000) {
        return;
    }
    if(c >= 0x10000) {
        hs = (WCHAR)(0xD800 | ((c >> 10) - 0x40));  /* Make high surrogate */
        wc = 0xDC00 | (c & 0x3FF);                  /* Make low surrogate */
    } else {
        hs = 0;
        wc = (WCHAR)c;
    }
#endif

#if FF_STRF_ENCODE == 1     /* Write a character in UTF-16LE */
    if(hs != 0) {
        st_word(&pb->buf[i], hs);
        i += 2;
        nc++;
    }
    st_word(&pb->buf[i], wc);
    i += 2;
#elif FF_STRF_ENCODE == 2   /* Write a character in UTF-16BE */
    if(hs != 0) {
        pb->buf[i++] = (BYTE)(hs >> 8);
        pb->buf[i++] = (BYTE)hs;
        nc++;
    }
    pb->buf[i++] = (BYTE)(wc >> 8);
    pb->buf[i++] = (BYTE)wc;
#elif FF_STRF_ENCODE == 3   /* Write it in UTF-8 */
    if(hs != 0) {               /* 4-byte */
        nc += 3;
        hs = (hs & 0x3FF) + 0x40;
        pb->buf[i++] = (BYTE)(0xF0 | hs >> 8);
        pb->buf[i++] = (BYTE)(0x80 | (hs >> 2 & 0x3F));
        pb->buf[i++] = (BYTE)(0x80 | (hs & 3) << 4 | (wc >> 6 & 0x0F));
        pb->buf[i++] = (BYTE)(0x80 | (wc & 0x3F));
    } else {
        if(wc < 0x80) {         /* 1-byte */
            pb->buf[i++] = (BYTE)wc;
        } else {
            if(wc < 0x800) {    /* 2-byte */
                nc += 1;
                pb->buf[i++] = (BYTE)(0xC0 | wc >> 6);
            } else {            /* 3-byte */
                nc += 2;
                pb->buf[i++] = (BYTE)(0xE0 | wc >> 12);
                pb->buf[i++] = (BYTE)(0x80 | (wc >> 6 & 0x3F));
            }
            pb->buf[i++] = (BYTE)(0x80 | (wc & 0x3F));
        }
    }
#else                       /* Write it in ANSI/OEM */
    if(hs != 0) {
        return;
    }
    wc = ff_uni2oem(wc, CODEPAGE);  /* UTF-16 ==> ANSI/OEM */
    if(wc == 0) {
        return;
    }
    if(wc >= 0x100) {
        pb->buf[i++] = (BYTE)(wc >> 8);
        nc++;
    }
    pb->buf[i++] = (BYTE)wc;
#endif

#else                                   /* ANSI/OEM input (without re-encode) */
    pb->buf[i++] = (BYTE)c;
#endif

    if(i >= (int)(sizeof pb->buf) - 4) {    /* Write buffered characters to the file */
        f_write(pb->fp, pb->buf, (UINT)i, &n);
        i = (n == (UINT)i) ? 0 : -1;
    }
    pb->idx = i;
    pb->nchr = nc + 1;
}


static int putc_flush(   /* Flush left characters in the buffer */
    putbuff *pb
)
{
    UINT nw;

    if(pb->idx >= 0        /* Flush buffered characters to the file */
            && f_write(pb->fp, pb->buf, (UINT)pb->idx, &nw) == FR_OK
            && (UINT)pb->idx == nw) {
        return pb->nchr;
    }
    return EOF;
}


static void putc_init(   /* Initialize write buffer */
    putbuff *pb,
    FIL *fp
)
{
    mem_set(pb, 0, sizeof(putbuff));
    pb->fp = fp;
}



int f_putc(
    TCHAR c,    /* A character to be output */
    FIL *fp     /* Pointer to the file object */
)
{
    putbuff pb;


    putc_init(&pb, fp);
    putc_bfd(&pb, c);   /* Put the character */
    return putc_flush(&pb);
}




/*-----------------------------------------------------------------------*/
/* Put a String to the File                                              */
/*-----------------------------------------------------------------------*/

int f_puts(
    const TCHAR *str,   /* Pointer to the string to be output */
    FIL *fp             /* Pointer to the file object */
)
{
    putbuff pb;


    putc_init(&pb, fp);
    while(*str) {
        putc_bfd(&pb, *str++);    /* Put the string */
    }
    return putc_flush(&pb);
}




/*-----------------------------------------------------------------------*/
/* Put a Formatted String to the File                                    */
/*-----------------------------------------------------------------------*/

int f_printf(
    FIL *fp,            /* Pointer to the file object */
    const TCHAR *fmt,   /* Pointer to the format string */
    ...                 /* Optional arguments... */
)
{
    va_list arp;
    putbuff pb;
    BYTE f, r;
    UINT i, j, w;
    DWORD v;
    TCHAR c, d, str[32], *p;


    putc_init(&pb, fp);

    va_start(arp, fmt);

    for(;;) {
        c = *fmt++;
        if(c == 0) {
            break;    /* End of string */
        }
        if(c != '%') {              /* Non escape character */
            putc_bfd(&pb, c);
            continue;
        }
        w = f = 0;
        c = *fmt++;
        if(c == '0') {              /* Flag: '0' padding */
            f = 1;
            c = *fmt++;
        } else {
            if(c == '-') {          /* Flag: left justified */
                f = 2;
                c = *fmt++;
            }
        }
        if(c == '*') {              /* Minimum width by argument */
            w = va_arg(arp, int);
            c = *fmt++;
        } else {
            while(IsDigit(c)) {     /* Minimum width */
                w = w * 10 + c - '0';
                c = *fmt++;
            }
        }
        if(c == 'l' || c == 'L') {  /* Type prefix: Size is long int */
            f |= 4;
            c = *fmt++;
        }
        if(c == 0) {
            break;
        }
        d = c;
        if(IsLower(d)) {
            d -= 0x20;
        }
        switch(d) {                 /* Atgument type is... */
        case 'S' :                  /* String */
            p = va_arg(arp, TCHAR *);
            for(j = 0; p[j]; j++) ;
            if(!(f & 2)) {                      /* Right padded */
                while(j++ < w) {
                    putc_bfd(&pb, ' ') ;
                }
            }
            while(*p) {
                putc_bfd(&pb, *p++) ;    /* String body */
            }
            while(j++ < w) {
                putc_bfd(&pb, ' ') ;    /* Left padded */
            }
            continue;

        case 'C' :                  /* Character */
            putc_bfd(&pb, (TCHAR)va_arg(arp, int));
            continue;

        case 'B' :                  /* Unsigned binary */
            r = 2;
            break;

        case 'O' :                  /* Unsigned octal */
            r = 8;
            break;

        case 'D' :                  /* Signed decimal */
        case 'U' :                  /* Unsigned decimal */
            r = 10;
            break;

        case 'X' :                  /* Unsigned hexdecimal */
            r = 16;
            break;

        default:                    /* Unknown type (pass-through) */
            putc_bfd(&pb, c);
            continue;
        }

        /* Get an argument and put it in numeral */
        v = (f & 4) ? (DWORD)va_arg(arp, long) : ((d == 'D') ? (DWORD)(long)va_arg(arp, int) : (DWORD)va_arg(arp, unsigned int));
        if(d == 'D' && (v & 0x80000000)) {
            v = 0 - v;
            f |= 8;
        }
        i = 0;
        do {
            d = (TCHAR)(v % r);
            v /= r;
            if(d > 9) {
                d += (c == 'x') ? 0x27 : 0x07;
            }
            str[i++] = d + '0';
        } while(v && i < sizeof str / sizeof * str);
        if(f & 8) {
            str[i++] = '-';
        }
        j = i;
        d = (f & 1) ? '0' : ' ';
        if(!(f & 2)) {
            while(j++ < w) {
                putc_bfd(&pb, d);    /* Right pad */
            }
        }
        do {
            putc_bfd(&pb, str[--i]);            /* Number body */
        } while(i);
        while(j++ < w) {
            putc_bfd(&pb, d);    /* Left pad */
        }
    }

    va_end(arp);

    return putc_flush(&pb);
}

#endif /* !FF_FS_READONLY */
#endif /* FF_USE_STRFUNC */



#if FF_CODE_PAGE == 0
/*-----------------------------------------------------------------------*/
/* Set Active Codepage for the Path Name                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_setcp(
    WORD cp     /* Value to be set as active code page */
)
{
    static const WORD       validcp[] = {  437,   720,   737,   771,   775,   850,   852,   857,   860,   861,   862,   863,   864,   865,   866,   869,   932,   936,   949,   950, 0};
    static const BYTE *const tables[] = {Ct437, Ct720, Ct737, Ct771, Ct775, Ct850, Ct852, Ct857, Ct860, Ct861, Ct862, Ct863, Ct864, Ct865, Ct866, Ct869, Dc932, Dc936, Dc949, Dc950, 0};
    UINT i;


    for(i = 0; validcp[i] != 0 && validcp[i] != cp; i++) ;  /* Find the code page */
    if(validcp[i] != cp) {
        return FR_INVALID_PARAMETER;    /* Not found? */
    }

    CodePage = cp;
    if(cp >= 900) {     /* DBCS */
        ExCvt = 0;
        DbcTbl = tables[i];
    } else {            /* SBCS */
        ExCvt = tables[i];
        DbcTbl = 0;
    }
    return FR_OK;
}
#endif  /* FF_CODE_PAGE == 0 */

